cascardo/linux.git
8 years agodevicetree: Add JZ4760/JZ4775 to Ingenic SoC UART binding
Matt Redfearn [Tue, 8 Sep 2015 15:55:36 +0000 (16:55 +0100)]
devicetree: Add JZ4760/JZ4775 to Ingenic SoC UART binding

Add these variants of the UART as compatible strings

Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
blah
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: 8250_ingenic: Enable FIFO for Ingenic UARTs
Matt Redfearn [Tue, 8 Sep 2015 15:55:35 +0000 (16:55 +0100)]
serial: 8250_ingenic: Enable FIFO for Ingenic UARTs

Enable the TX/RX FIFOs present on UARTs in Ingenic SoCs.
FIFO sizes vary per device so match these based on
the OF compatible string

Enabling the FIFOs permits much faster transfer with
lower CPU overhead.

Tested on Ingenic JZ4780 on the MIPS Ci20 Creator board

Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: 8250_ingenic: Enable hardware flow control
Matt Redfearn [Tue, 8 Sep 2015 15:55:34 +0000 (16:55 +0100)]
serial: 8250_ingenic: Enable hardware flow control

The Ingenic UART is similar to a standard 16550, but hardware flow control
requires setting a couple of additional, non-standard bits in the MCR.

The non-standard "modem control enable" and "hardware flow control
mode" bits are set when writing to the MCR register, based
on whether the modem control interrupt is active.

Additionally the non-16550 compliant parts of the uart need to be
masked from higher layers.

Tested on Ingenic JZ4780 on MIPS Creator Ci20 board

Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sc16is7xx: Remove unnecessary MODULE_ALIAS()
Javier Martinez Canillas [Sun, 30 Aug 2015 21:42:14 +0000 (23:42 +0200)]
serial: sc16is7xx: Remove unnecessary MODULE_ALIAS()

The driver has a I2C device id table that is used to create the modaliases
and also "sc16is7xx" is not a supported I2C id, so it's never used.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: mux: Convert to uart_console_device instead of open-coded
Axel Lin [Sat, 19 Sep 2015 03:43:07 +0000 (11:43 +0800)]
serial: mux: Convert to uart_console_device instead of open-coded

The implementation of mux_console_device() is very similar to
uart_console_device(). Setting .data field in mux_console then we can
convert to use uart_console_device().

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: 68328serial: Use NULL for pointers
Fabio Estevam [Tue, 25 Aug 2015 19:49:46 +0000 (16:49 -0300)]
serial: 68328serial: Use NULL for pointers

Compare pointer-typed values to NULL rather than 0

The semantic patch that makes this change is available
in scripts/coccinelle/null/badzero.cocci.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: samsung: Fix UART status handling in DMA mode
Robert Baldyga [Tue, 15 Sep 2015 12:49:00 +0000 (14:49 +0200)]
serial: samsung: Fix UART status handling in DMA mode

So far, when interrupt occured in DMA mode, it was handled by terminating
DMA transfer and draining data remaining in RX FIFO. It worked well
until interrupt was caused by timeout, but the same interrupt can be
alse caused by special condition (eg. 'break'), which requires special
handling. In such case handling mechanism was the same - DMA transaction
was terminated and FIFO was drained, but any special conditions were
ingnored. Because of this in DMA mode there was no ability to use,
for example, Magic SysRq.

This patch fixes this problem by using s3c24xx_serial_rx_drain_fifo()
function instead of uart_rx_drain_fifo(), which does the same thing
(drains RX FIFO) plus checks UART status to detect special conditions
(such as 'break'). Thanks to this we have exactly the same UART status
handling in both DMA and PIO mode.

This change additionally simplifies RX handling code, as we no longer
need uart_rx_drain_fifo() function, so we can remove it.

Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: samsung: introduce s3c24xx_serial_rx_drain_fifo() function
Robert Baldyga [Tue, 15 Sep 2015 12:48:59 +0000 (14:48 +0200)]
serial: samsung: introduce s3c24xx_serial_rx_drain_fifo() function

This patch introduces s3c24xx_serial_rx_drain_fifo() which reads data
from RX FIFO and writes it to tty buffer. It also checks for special
conditions (such as 'break') and handles it. This function has been
separated from s3c24xx_serial_rx_chars_pio() as it contains code which
can be used also in DMA mode.

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: samsung: remove unneded 'ignore_char' label
Robert Baldyga [Tue, 15 Sep 2015 12:48:58 +0000 (14:48 +0200)]
serial: samsung: remove unneded 'ignore_char' label

This label does nothing special and we don't need to have it anymore.

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: samsung: remove unused 'irq' parameter
Robert Baldyga [Tue, 15 Sep 2015 12:48:57 +0000 (14:48 +0200)]
serial: samsung: remove unused 'irq' parameter

This parameter is not used anywhere, so we can get rid of it.

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Add DT support to DMA setup
Geert Uytterhoeven [Fri, 18 Sep 2015 11:08:33 +0000 (13:08 +0200)]
serial: sh-sci: Add DT support to DMA setup

Add support for obtaining DMA channel information from the device tree.

This requires switching from the legacy sh_dmae_slave structures with
hardcoded channel numbers and the corresponding filter function to:
  1. dma_request_slave_channel_compat(),
       - On legacy platforms, dma_request_slave_channel_compat() uses
 the passed DMA channel numbers that originate from platform
 device data,
       - On DT-based platforms, dma_request_slave_channel_compat() will
 retrieve the information from DT.
  2. and the generic dmaengine_slave_config() configuration method,
     which requires filling in DMA register ports and slave bus widths.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Pause DMA engine and get DMA status again
Muhammad Hamza Farooq [Fri, 18 Sep 2015 11:08:32 +0000 (13:08 +0200)]
serial: sh-sci: Pause DMA engine and get DMA status again

Occasionally, DMA transaction completes _after_ DMA engine is stopped.
Verify if the transaction has not finished before forcing the engine to
stop and push the data

Signed-off-by: Muhammad Hamza Farooq <mfarooq@visteon.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Do not terminate DMA engine when race condition occurs
Muhammad Hamza Farooq [Fri, 18 Sep 2015 11:08:31 +0000 (13:08 +0200)]
serial: sh-sci: Do not terminate DMA engine when race condition occurs

When DMA packet completion and timer expiry take place at the same time,
do not terminate the DMA engine, leading by submission of new
descriptors, as the DMA communication hasn't necessarily stopped here.

Signed-off-by: Muhammad Hamza Farooq <mfarooq@visteon.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Call dma_async_issue_pending when transaction completes
Muhammad Hamza Farooq [Fri, 18 Sep 2015 11:08:30 +0000 (13:08 +0200)]
serial: sh-sci: Call dma_async_issue_pending when transaction completes

dmaengine_submit() will not start the DMA operation, it merely adds
it to the pending queue.  If the queue is no longer running, it won't be
restarted until dma_async_issue_pending() is called.

Signed-off-by: Muhammad Hamza Farooq <mfarooq@visteon.com>
[geert: Add more description]
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Redirect port interrupts to CPU _only_ when DMA stops
Muhammad Hamza Farooq [Fri, 18 Sep 2015 11:08:29 +0000 (13:08 +0200)]
serial: sh-sci: Redirect port interrupts to CPU _only_ when DMA stops

Since the DMA engine is not stopped everytime rx_timer_fn is called, the
interrupts have to be redirected back to CPU only when incomplete DMA
transaction is handled

Signed-off-by: Muhammad Hamza Farooq <mfarooq@visteon.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Remove timer on shutdown of port
Aleksandar Mitev [Fri, 18 Sep 2015 11:08:28 +0000 (13:08 +0200)]
serial: sh-sci: Remove timer on shutdown of port

This prevents DMA timer timeout that can trigger after the port has
been closed.

Signed-off-by: Aleksandar Mitev <amitev@visteon.com>
[geert: Move del_timer_sync() outside spinlock to avoid circular locking
        dependency between rx_timer_fn() and del_timer_sync()]
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Stop calling sci_start_rx() from sci_request_dma()
Geert Uytterhoeven [Fri, 18 Sep 2015 11:08:27 +0000 (13:08 +0200)]
serial: sh-sci: Stop calling sci_start_rx() from sci_request_dma()

There's no need to call sci_start_rx() from sci_request_dma() when DMA
setup fails, as sci_startup() will call sci_start_rx() anyway.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Submit RX DMA from RX interrupt on (H)SCIF
Geert Uytterhoeven [Fri, 18 Sep 2015 11:08:26 +0000 (13:08 +0200)]
serial: sh-sci: Submit RX DMA from RX interrupt on (H)SCIF

For DMA receive requests, the driver is only notified by DMA completion
after the whole DMA request has been transferred.  If less data is
received, it will stay stuck until more data arrives.  The driver
handles this by setting up a timer handler from the receive interrupt,
after reception of the first character.

Unlike SCIFA and SCIFB, SCIF and HSCIF don't issue receive interrupts on
reception of individual characters if a receive DMA request is in
progress, so the timer is never set up.

To fix receive DMA on SCIF and HSCIF, submit the receive DMA request
from the receive interrupt handler instead.
In some sense this is similar to the SCIFA/SCIFB behavior, where the
RDRQE (Rx Data Transfer Request Enable) bit is also set from the receive
interrupt handler.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Get rid of the workqueue to handle receive DMA requests
Geert Uytterhoeven [Fri, 18 Sep 2015 11:08:25 +0000 (13:08 +0200)]
serial: sh-sci: Get rid of the workqueue to handle receive DMA requests

The receive DMA workqueue function work_fn_rx() handles two things:
  1. Reception of a full buffer on completion of a receive DMA request,
  2. Reception of a partial buffer on receive DMA time-out.
The workqueue is kicked by both the receive DMA completion handler, and
by a timer to handle DMA time-out.

As there are always two receive DMA requests active, it's possible that
the receive DMA completion handler is called a second time before the
workqueue function runs.

As the time-out handler re-enables the receive interrupt, an interrupt
may come in before time-out has been fully handled.

Move part 1 into the receive DMA completion handler, and move part 2
into the receive DMA time-out handler, to fix these race conditions.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Shuffle functions around
Geert Uytterhoeven [Fri, 18 Sep 2015 11:08:24 +0000 (13:08 +0200)]
serial: sh-sci: Shuffle functions around

This allows to:
  - Remove forward declarations of static functions,
  - Coalesce two sections protected by #ifdef CONFIG_SERIAL_SH_SCI_DMA,
  - Avoid shuffling functions around in the near future,
  - Avoid adding forward declarations in the near future.

No functional changes.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Add device tree support for r8a7795
Kuninori Morimoto [Wed, 30 Sep 2015 09:57:33 +0000 (11:57 +0200)]
serial: sh-sci: Add device tree support for r8a7795

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Don't call sci_dma_rx_push() if no data has arrived
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:57 +0000 (20:02 +0200)]
serial: sh-sci: Don't call sci_dma_rx_push() if no data has arrived

On receive DMA time-out, avoid calling sci_dma_rx_push() if no data was
transferred by the timed out DMA request.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Don't kick tx in sci_er_interrupt() when using DMA
Yoshihiro Shimoda [Fri, 21 Aug 2015 18:02:56 +0000 (20:02 +0200)]
serial: sh-sci: Don't kick tx in sci_er_interrupt() when using DMA

If CONFIG_SERIAL_SH_SCI_DMA is enabled, the driver doesn't enable TIE
on SCIF or HSCIF. However, this driver may call sci_tx_interrupt()
in sci_er_interrupt(). After that, the driver cannot care of the
interrupt, and then "irq 109: nobody cared" happens on r8a7791/koelsch
board. This patch fixes the issue.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
[geert] Keep kicking tx when using PIO
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Don't call sci_rx_interrupt() on error when using DMA
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:55 +0000 (20:02 +0200)]
serial: sh-sci: Don't call sci_rx_interrupt() on error when using DMA

The error handler calls sci_rx_interrupt() to drain the receive FIFO if
an error condition happens.

However, if DMA is enabled on SCIFA or SCIFB, this will call
disable_irq_nosync() twice. Due to this imbalance, the receive interrupt
will never be re-enabled, and reception stops forever.

To fix this, restrict draining the FIFO to PIO mode, and just call
sci_receive_chars() directly.

Inspired by a patch from Yoshihiro Shimoda
<yoshihiro.shimoda.uh@renesas.com>.

Reported-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Fix NULL pointer dereference if HIGHMEM is enabled
Yoshihiro Shimoda [Fri, 21 Aug 2015 18:02:54 +0000 (20:02 +0200)]
serial: sh-sci: Fix NULL pointer dereference if HIGHMEM is enabled

This patch fixes an issue that this driver causes a NULL pointer
dereference in the following conditions:
 - CONFIG_HIGHMEM and CONFIG_SERIAL_SH_SCI_DMA are enabled
 - This driver runs on the sci_dma_rx_push()

This issue was caused by virt_to_page(buf) in the sci_request_dma()
because this driver didn't check if the "buf" was valid or not.  So,
this patch uses the "buf" from dma_alloc_coherent() as is, not page.

This patch also fixes a WARNING issue in sci_rx_dma_release():

    WARNING: CPU: 0 PID: 1328 at lib/dma-debug.c:1125 check_unmap+0x444/0x848()
    rcar-dmac e6700000.dma-controller: DMA-API: device driver frees DMA memory with different CPU address [device address=0x000000006dd89000] [size=64 bytes] [cpu alloc address=0x000000016189c000] [cpu free address=0x0000000080000000]

    WARNING: CPU: 1 PID: 1 at drivers/base/dma-mapping.c:334 dma_common_free_remap+0x48/0x6c()
    trying to free invalid coherent area:   (null)

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
[geert] Rebased
[geert] Reworded
[geert] Dropped .rx_chunk, as it's always identical to .rx_buf[0]
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Use incrementing pointers instead of stack array
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:53 +0000 (20:02 +0200)]
serial: sh-sci: Use incrementing pointers instead of stack array

There's no need to keep all buffer and DMA pointers on the stack.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Use tty_insert_flip_string() for DMA receive
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:52 +0000 (20:02 +0200)]
serial: sh-sci: Use tty_insert_flip_string() for DMA receive

Switch from using tty_buffer_request_room() and looping over
tty_insert_flip_char() to tty_insert_flip_string().
Keep track of buffer overruns in the icount structure, like
serial_core.c does.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Pass scatterlist to sci_dma_rx_push()
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:51 +0000 (20:02 +0200)]
serial: sh-sci: Pass scatterlist to sci_dma_rx_push()

Currently sci_dma_rx_push() has to find the active scatterlist itself,
but in some cases the caller already knows.

Hence let the caller pass the scatterlist, and introduce a helper to
find the active DMA request while we're at it.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Fix race condition between RX worker and cleanup
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:50 +0000 (20:02 +0200)]
serial: sh-sci: Fix race condition between RX worker and cleanup

During serial port shutdown, the DMA receive worker function may still
be called after the receive DMA cleanup function has been called.
Fix this race condition between work_fn_rx() and sci_rx_dma_release() by
acquiring the port's spinlock in sci_rx_dma_release().
This requires releasing the spinlock in work_fn_rx() before calling (any
function that may call) sci_rx_dma_release().

Terminate all active receive DMA descriptors to release them, and to
make sure no more completions come in.

Do the same in sci_tx_dma_release() for symmetry, although the serial
upper layer will no longer submit more data at this point of time.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Fix exclusion of work_fn_rx and sci_dma_rx_complete
Kazuya Mizuguchi [Fri, 21 Aug 2015 18:02:49 +0000 (20:02 +0200)]
serial: sh-sci: Fix exclusion of work_fn_rx and sci_dma_rx_complete

There is a problem when the sci_dma_rx_complete() is processed
before cancel process of work_fn_rx() completes by rx_timer_fn().
This patch locks work_fn_rx().

Signed-off-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com>
Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Do not resubmit DMA descriptors
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:48 +0000 (20:02 +0200)]
serial: sh-sci: Do not resubmit DMA descriptors

Resubmission of DMA descriptors is explicitly forbidden by the DMA
engine API.

Hence pass DMA_CTRL_ACK to dmaengine_prep_slave_sg(), and prepare a new
DMA descriptor instead of reusing the old one.
Remove sci_port.desc_rx[], as there's no longer a need to access the
active descriptor.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Simplify sci_submit_rx() error handling
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:47 +0000 (20:02 +0200)]
serial: sh-sci: Simplify sci_submit_rx() error handling

Simplify the error handling in sci_submit_rx() by
  - Moving it to the end of the function,
  - Just calling dmaengine_terminate_all() instead of calling
    async_tx_ack() for all already submitted descriptors.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Stop acknowledging DMA transmit completions
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:46 +0000 (20:02 +0200)]
serial: sh-sci: Stop acknowledging DMA transmit completions

As dmaengine_prep_slave_sg() is called with the DMA_CTRL_ACK flag set
for DMA transmit requests, there's no need to explicitly acknowledge DMA
transmit requests in the DMA transmit completion callback.

Hence remove the call to async_tx_ack(), and remove the now unused
dma_async_tx_descriptor pointer in the sci_port structure.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Switch to generic DMA residue handling
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:45 +0000 (20:02 +0200)]
serial: sh-sci: Switch to generic DMA residue handling

Convert the SCI driver from the SHDMAE-specific partial DMA transfer
handling to the generic dmaengine residual data framework.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Use DMA submission helpers instead of open-coding
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:44 +0000 (20:02 +0200)]
serial: sh-sci: Use DMA submission helpers instead of open-coding

Replace open-coded
  - calls to dma_async_tx_descriptor.tx_submit() by calls to the
    dmaengine_submit() helper,
  - dma_cookie_t comparisons by calls to dma_submit_error().

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Fix TX buffer mapping leak
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:43 +0000 (20:02 +0200)]
serial: sh-sci: Fix TX buffer mapping leak

The mapped transmit buffer is never unmapped. This leaks quite some
mappings, as the mapping is done in uart_ops.startup(), i.e. every time
the device is opened. Unmap the buffer on device close.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Switch to dma_map_single() for DMA transmission
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:42 +0000 (20:02 +0200)]
serial: sh-sci: Switch to dma_map_single() for DMA transmission

Simplify the DMA transmit code by using dma_map_single() instead of
constantly modifying the single-entry scatterlist to match what's
currently being transmitted.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Use min_t()/max_t() instead of casts
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:41 +0000 (20:02 +0200)]
serial: sh-sci: Use min_t()/max_t() instead of casts

When comparing differently sized types, it's better to use
min_t()/max_t() than adding casts.

Also use "unsigned int" instead of "int", as that's the right type for
the length of an SG entry.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Use correct device for DMA mapping with IOMMU
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:40 +0000 (20:02 +0200)]
serial: sh-sci: Use correct device for DMA mapping with IOMMU

To function correctly in the presence of an IOMMU, the DMA buffers must
be managed using the DMA channel's device instead of the platform
device's device.

Make sure to free the DMA memory before releasing the channel, not
after.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Handle DMA init failures inside sci_request_dma()
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:39 +0000 (20:02 +0200)]
serial: sh-sci: Handle DMA init failures inside sci_request_dma()

Let sci_request_dma() handle failures to initialize DMA itself.
This way sci_tx_dma_release() and sci_rx_dma_release() don't have to
consider partial initialization, and thus don't need to reset DMA
addresses to DMA_ERROR_CODE, which is not 100% portable access
architectures.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Improve comments for DMA timeout calculation
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:38 +0000 (20:02 +0200)]
serial: sh-sci: Improve comments for DMA timeout calculation

Reformat, grammar improvements, use "ms" instead of "msec".

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Improve DMA error messages
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:37 +0000 (20:02 +0200)]
serial: sh-sci: Improve DMA error messages

Make the life of the driver developer/debugger easier:
  - Add __func__ prefix to identical messages,
  - Add DMA directions to messages,
  - Add TX failure messages,
  - Always use "cookie %d" for DMA cookies,
  - "#%d" is reserved for the DMA cookie/descriptor index.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Return IRQ_HANDLED when overrun if detected
Yoshihiro Shimoda [Fri, 21 Aug 2015 18:02:36 +0000 (20:02 +0200)]
serial: sh-sci: Return IRQ_HANDLED when overrun if detected

This patch fix an issue that the driver may cause "nobody cared" IRQ
when this driver detects the overrun flag only.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Remove bogus sci_handle_fifo_overrun() call on (H)SCIF
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:35 +0000 (20:02 +0200)]
serial: sh-sci: Remove bogus sci_handle_fifo_overrun() call on (H)SCIF

Commit 8b6ff84c2d445a47 ("serial: sh-sci: Fix R-Car SCIF and HSCIF
overrun handling") added overrun handling for (H)SCIF using the SCLSR
register, but also accidentally added a bogus call to
sci_handle_fifo_overrun() in the receive interrupt path.

Remove it again.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Remove useless memory allocation failure printks
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:34 +0000 (20:02 +0200)]
serial: sh-sci: Remove useless memory allocation failure printks

Printing an error on memory allocation failures is unnecessary.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Make sci_regmap[] const
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:33 +0000 (20:02 +0200)]
serial: sh-sci: Make sci_regmap[] const

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Make sci_irq_desc[] const
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:32 +0000 (20:02 +0200)]
serial: sh-sci: Make sci_irq_desc[] const

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Improve readability of sampling rate configuration
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:31 +0000 (20:02 +0200)]
serial: sh-sci: Improve readability of sampling rate configuration

Reorder sampling_rate assignment for consistency in all cases of the
switch statement.
Avoid using the ternary conditional operator to make it more clear that
the value is overridden by platform data.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Drop path in reference to serial_core.c
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:30 +0000 (20:02 +0200)]
serial: sh-sci: Drop path in reference to serial_core.c

serial_core.c was moved from drivers/serial/ to drivers/tty/serial/ a
while ago. Remove the path to make it move-proof.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Use SCSMR_CKS instead of hardcoded literal 3
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:29 +0000 (20:02 +0200)]
serial: sh-sci: Use SCSMR_CKS instead of hardcoded literal 3

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Use SCIF_DR instead of hardcoded literal 1
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:28 +0000 (20:02 +0200)]
serial: sh-sci: Use SCIF_DR instead of hardcoded literal 1

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Correct SCIF_ERROR_CLEAR for plain SCIF
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:27 +0000 (20:02 +0200)]
serial: sh-sci: Correct SCIF_ERROR_CLEAR for plain SCIF

SCIF_ERROR_CLEAR includes SCIFA_ORER, which exists only on SCIFA/SCIFB
and SCIF on sh7705/sh7720/sh7721.

To fix this:
  1. Remove SCIFA_ORER from the definition of SCIF_ERROR_CLEAR,
  2. During initialization, store the error clear mask to use,
     incorporating the overrun bit only if it applies to the SCxSR
     register.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Prevent compiler warnings on 64-bit
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:26 +0000 (20:02 +0200)]
serial: sh-sci: Prevent compiler warnings on 64-bit

Expressions involving "BIT(...)" create values of type "long", which is
64-bit on 64-bit.  Hence "~BIT(...)" no longer fits in 32-bit, which
will cause future compiler warnings when assigning to 32-bit variables:

    drivers/tty/serial/sh-sci.c: In function 'sci_init_single':
    drivers/tty/serial/sh-sci.h:58:25: warning: large integer implicitly truncated to unsigned type [-Woverflow]
     #define SCI_ERROR_CLEAR ~(SCI_RESERVED | SCI_PER | SCI_FER | SCI_ORER)
     ^
    drivers/tty/serial/sh-sci.c:2325:27: note: in expansion of macro 'SCI_ERROR_CLEAR'
       sci_port->error_clear = SCI_ERROR_CLEAR;

As these values are (at most) 32-bit register values anyway, cast them
to "u32" at the definition level to prevent such compiler warnings.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: sh-sci: Replace buggy big #ifdef by runtime logic
Geert Uytterhoeven [Fri, 21 Aug 2015 18:02:25 +0000 (20:02 +0200)]
serial: sh-sci: Replace buggy big #ifdef by runtime logic

The #ifdef logic to clear SCxSR bits using RMW on SCIFA/SCIFB and SCIF
variants with some SCIFA features (sh7705/SH7720/sh7721) has several
drawbacks:
  - It wasn't updated for newer R-Mobile variants (APE6),
  - It doesn't correctly handle SoCs with both SCIF and SCIFA/B (e.g.
    R-Car Gen2, but also legacy sh7723/sh7724),
  - It doesn't play well with ARM multi-platform kernels: on R-Car Gen2,
    SCIF/SCIFA/SCIFB/HSCIF were handled differently, depending on
    whether r8a7740 or sh73a0 support was enabled or not,

Replace the #ifdef logic by runtime logic to fix this.

SCIFA/SCIFB and SCIF on sh7705/sh7720/sh7721 use RMW to clear error
bits, other variants use plain stores, as before.

Note that this changes behavior for SCIFA on sh7723/sh7724 (these SoCs
have both SCIF and SCIFA), which didn't use RMW before.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: 8250: Fix autoconfig_irq() to avoid race conditions
Taichi Kageyama [Mon, 17 Aug 2015 02:45:29 +0000 (02:45 +0000)]
serial: 8250: Fix autoconfig_irq() to avoid race conditions

The following race conditions can happen when a serial port is used
as console.

Case1: CPU_B is used to detect an interrupt from a serial port,
       but it can have interrupts disabled during the waiting time.
Case2: CPU_B clears UART_IER just after CPU_A sets UART_IER and then
       a serial port may not make an interrupt.
Case3: CPU_A sets UART_IER just after CPU_B clears UART_IER.
       This is an unexpected behavior for serial8250_console_write().

CPU_A [autoconfig_irq]      |  CPU_B [serial8250_console_write]
----------------------------|---------------------------------------
                            |
probe_irq_on()              |  spin_lock_irqsave(&port->lock,)
serial_outp(,UART_IER,0x0f) |  serial_out(,UART_IER,0)
udelay(20);                 |  uart_console_write()
probe_irq_off()             |
                            |  spin_unlock_irqrestore(&port->lock,)

Case1 and 2 can make autoconfig_irq() failed.
In these cases, the console doesn't work in interrupt mode and
"input overrun" (which can make operation mistakes) can happen
on some systems. Especially in the Case1, It is known that the
problem happens with high rate every boot once it occurs
because the boot sequence is always almost same.

port mutex makes sure that the autoconfig operation is exclusive of
any other concurrent HW access except by the console operation.
console lock is required in autoconfig_irq().

Signed-off-by: Taichi Kageyama <t-kageyama@cp.jp.nec.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: mpc52xx: add delay after resetting transmitter to fix broken chars
Uwe Kleine-König [Thu, 24 Sep 2015 19:18:34 +0000 (21:18 +0200)]
serial: mpc52xx: add delay after resetting transmitter to fix broken chars

This fixes receiving broken characters on the console from an MPC5125
system when systemd comes up which repeatedly opens and shuts down the
console device.

Trial and error with the needed interval showed that 500 us are good
enough most of the time when using 38400 Bd, so I think 1 ms is a good
compromise between fixing the issue and not penalize faster setups too
much.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrivers/tty: make serial 8250_lpc18xx.c Kconfig a tristate
Paul Gortmaker [Wed, 19 Aug 2015 21:48:09 +0000 (17:48 -0400)]
drivers/tty: make serial 8250_lpc18xx.c Kconfig a tristate

The Kconfig currently controlling compilation of this code is:

8250/Kconfig:config SERIAL_8250_LPC18XX
8250/Kconfig:        bool "NXP LPC18xx/43xx serial port support"

...meaning that it currently is not being built as a module by anyone.

When targetting orphaned modular code in non-modular drivers, this
came up.  Joachim indicated that the driver was actually meant to
be tristate but ended up bool by accident.  So here we make it
tristate instead of removing the modular code that was essentially
orphaned.

Suggested-by: Joachim Eastwood <manabian@gmail.com>
Cc: Jiri Slaby <jslaby@suse.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Acked-by: Joachim Eastwood <manabian@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrivers/tty: make serial/mpsc.c driver explicitly non-modular
Paul Gortmaker [Wed, 19 Aug 2015 21:48:08 +0000 (17:48 -0400)]
drivers/tty: make serial/mpsc.c driver explicitly non-modular

The Kconfig for this driver is currently:

config SERIAL_MPSC
        bool "Marvell MPSC serial port support"

...meaning that it currently is not being built as a module by anyone.
Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.

Since module_init translates to device_initcall in the non-modular
case, the init ordering remains unchanged with this commit.

We leave some tags like MODULE_AUTHOR for documentation purposes.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: linux-serial@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrivers/tty: make hvc_console.c explicitly non-modular
Paul Gortmaker [Wed, 19 Aug 2015 21:48:07 +0000 (17:48 -0400)]
drivers/tty: make hvc_console.c explicitly non-modular

The Kconfig currently controlling compilation of this code is:

drivers/tty/hvc/Kconfig:config HVC_DRIVER
drivers/tty/hvc/Kconfig:        bool

...meaning that it currently is not being built as a module by anyone.

Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only, even
though someone bothered to comment that the code was not used.

Unlike other changes, this driver binds in w/o using module_init,
so we dont have init ordering concerns with this commit.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrivers/tty: make sysrq.c slightly more explicitly non-modular
Paul Gortmaker [Wed, 19 Aug 2015 21:48:06 +0000 (17:48 -0400)]
drivers/tty: make sysrq.c slightly more explicitly non-modular

The Kconfig currently controlling compilation of this code is:

config.debug:config MAGIC_SYSRQ
      bool "Magic SysRq key"

...meaning that it currently is not being built as a module by anyone.

Lets remove the traces of modularity we can so that when reading the
driver there is less doubt it is builtin-only.

Since module_init translates to device_initcall in the non-modular
case, the init ordering remains unchanged with this commit.

We don't delete the module.h include since other parts of the file are
using content from there.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrivers/tty: make pty.c slightly more explicitly non-modular
Paul Gortmaker [Wed, 19 Aug 2015 21:48:05 +0000 (17:48 -0400)]
drivers/tty: make pty.c slightly more explicitly non-modular

The Kconfig currently controlling compilation of this code is:

drivers/tty/Kconfig:config LEGACY_PTYS
drivers/tty/Kconfig:    bool "Legacy (BSD) PTY support"

...and:

drivers/tty/Kconfig:config UNIX98_PTYS
drivers/tty/Kconfig:    bool "Unix98 PTY support" if EXPERT

combined with this:

obj-$(CONFIG_LEGACY_PTYS)       += pty.o
obj-$(CONFIG_UNIX98_PTYS)       += pty.o

...meaning that it currently is not being built as a module by anyone.

Lets remove the traces of modularity we can so that when reading the
driver there is less doubt it is builtin-only.

Since module_init translates to device_initcall in the non-modular
case, the init ordering remains unchanged with this commit.

We don't delete the module.h include since other parts of the file are
using content from there.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: don't register CIR serial ports
Maciej S. Szmigiero [Sun, 27 Sep 2015 14:25:56 +0000 (16:25 +0200)]
serial: don't register CIR serial ports

CIR type serial ports aren't real serial ports.

This is just a way to prevent legacy 8250 serial
driver from probing and eventually binding some
resources.

Since in current state such ports aren't providing
any real functionality and it is not possible
to change their type via setserial/ioctl(TIOCSSERIAL)
(due to UPF_FIXED_PORT flag set on them)
it is simpler and cleaner to not register them at all
with serial core.

Print a short message in this case so it is known
to user what has happened.

This way checks for PORT_8250_CIR in serial port
callbacks can be removed too, since they won't
ever be called.

Signed-off-by: Maciej Szmigiero <mail@maciej.szmigiero.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: 8250_omap: check how many bytes were injected
Sebastian Andrzej Siewior [Fri, 14 Aug 2015 16:01:03 +0000 (18:01 +0200)]
serial: 8250_omap: check how many bytes were injected

The function tty_insert_flip_string() returns an int and as such it
might fail. So the result is that I kindly asked to insert 48 bytes and
the function only insterted 32.
I have no idea what to do with the remaining 16 so I think dropping them
is the only option. I also increase the buf_overrun counter so userpace
has a clue that we lost bytes.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoLinux 4.3-rc3 v4.3-rc3
Linus Torvalds [Sun, 27 Sep 2015 11:50:08 +0000 (07:50 -0400)]
Linux 4.3-rc3

8 years agoMerge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 27 Sep 2015 10:51:42 +0000 (06:51 -0400)]
Merge branch 'x86-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull x86 fixes from Thomas Gleixner:
 "Two bugfixes from Andy addressing at least some of the subtle NMI
  related wreckage which has been reported by Sasha Levin"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/nmi/64: Fix a paravirt stack-clobbering bug in the NMI code
  x86/paravirt: Replace the paravirt nop with a bona fide empty function

8 years agoMerge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 27 Sep 2015 10:50:23 +0000 (06:50 -0400)]
Merge branch 'irq-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull irq fix from Thomass Gleixner:
 "A bugfix for the atmel aic5 irq chip driver which caches the wrong
  data and thereby breaking resume"

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/atmel-aic5: Use per chip mask caches in mask/unmask()

8 years agoMerge branch 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm
Linus Torvalds [Sun, 27 Sep 2015 10:48:48 +0000 (06:48 -0400)]
Merge branch 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm

Pull ARM fixes from Russell King:
 "Just two fixes: wire up the new system calls added during the last
  merge window, and fix another user access site"

* 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm:
  ARM: alignment: fix alignment handling for uaccess changes
  ARM: wire up new syscalls

8 years agoMerge tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Linus Torvalds [Sun, 27 Sep 2015 10:45:18 +0000 (06:45 -0400)]
Merge tag 'armsoc-fixes' of git://git./linux/kernel/git/arm/arm-soc

Pull ARM SoC fixes from Olof Johansson:
 "Our first real batch of fixes this release cycle.  Nothing really
  concerning, and diffstat is a bit inflated due to some DT contents
  moving around on STi platforms.

  There's a collection of them here:

   - A fixup for a build breakage that hits on arm64 allmodconfig in
     QCOM SCM firmware drivers
   - MMC fixes for OMAP that had quite a bit of breakage this merge
     window.
   - Misc build/warning fixes on PXA and OMAP
   - A couple of minor fixes for Beagleboard X15 which is now starting
     to see a few more users in the wild"

* tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (31 commits)
  ARM: sti: dt: adapt DT to fix probe/bind issues in DRM driver
  ARM: dts: fix omap2+ address translation for pbias
  firmware: qcom: scm: Add function stubs for ARM64
  ARM: dts: am57xx-beagle-x15: use palmas-usb for USB2
  ARM: omap2plus_defconfig: enable GPIO_PCA953X
  ARM: dts: omap5-uevm.dts: fix i2c5 pinctrl offsets
  ARM: OMAP2+: AM43XX: Enable autoidle for clks in am43xx_init_late
  ARM: dts: am57xx-beagle-x15: Update Phy supplies
  ARM: pxa: balloon3: Fix build error
  ARM: dts: Fixup model name for HP t410 dts
  ARM: dts: DRA7: fix a typo in ethernet
  ARM: omap2plus_defconfig: make PCF857x built-in
  ARM: dts: Use ti,pbias compatible string for pbias
  ARM: OMAP5: Cleanup options for SoC only build
  ARM: DRA7: Select missing options for SoC only build
  ARM: OMAP2+: board-generic: Remove stale of_irq macros
  ARM: OMAP4+: PM: erratum is used by OMAP5 and DRA7 as well
  ARM: dts: omap3-igep: Move eth IRQ pinmux to IGEPv2 common dtsi
  ARM: dts: am57xx-beagle-x15: Add wakeup irq for mcp79410
  ARM: dts: am335x-phycore-som: Fix mpu voltage
  ...

8 years agoMerge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6
Linus Torvalds [Sun, 27 Sep 2015 10:42:54 +0000 (06:42 -0400)]
Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6

Pull CIFS fixes from Steve French:
 "Four fixes from testing at the recent SMB3 Plugfest including two
  important authentication ones (one fixes authentication problems to
  some popular servers when clock times differ more than two hours
  between systems, the other fixes Kerberos authentication for SMB3)"

* 'for-next' of git://git.samba.org/sfrench/cifs-2.6:
  fix encryption error checks on mount
  [SMB3] Fix sec=krb5 on smb3 mounts
  cifs: use server timestamp for ntlmv2 authentication
  disabling oplocks/leases via module parm enable_oplocks broken for SMB3

8 years agoMerge tag 'pxa-fixes-v4.3' of https://github.com/rjarzmik/linux into fixes
Olof Johansson [Sun, 27 Sep 2015 05:23:26 +0000 (22:23 -0700)]
Merge tag 'pxa-fixes-v4.3' of https://github.com/rjarzmik/linux into fixes

ARM: pxa: fixes for v4.3

These fixes are mainly regression fixes triggered by irq changes,
common clock framework introduction and sound side-effect of
other platforms.

* tag 'pxa-fixes-v4.3' of https://github.com/rjarzmik/linux:
  ARM: pxa: balloon3: Fix build error
  ARM: pxa: ssp: Fix build error by removing originally incorrect DT binding
  ARM: pxa: fix DFI bus lockups on startup

Signed-off-by: Olof Johansson <olof@lixom.net>
8 years agoMerge tag 'omap-for-v4.3/fixes-rc2' of git://git.kernel.org/pub/scm/linux/kernel...
Olof Johansson [Sun, 27 Sep 2015 05:22:31 +0000 (22:22 -0700)]
Merge tag 'omap-for-v4.3/fixes-rc2' of git://git./linux/kernel/git/tmlind/linux-omap into fixes

Fixes for omaps for v4.3-rc cycle:

- Two more patches to fix most of the MMC regressions with the
  PBIAS regulator changes. At least two MMC driver related issues
  still seems to remain for omap3 legacy booting and omap4 duovero.
  Note that the dts changes depend on a recent regulator fix, and
  are based on the regulator commit now in mainline kernel

- Enable autoidle for am43xx clocks to prevent clocks from staying
  always on

- Fix i2c5 pinctrl offsets for omap5-uevm

- Enable PCA953X as that's needed for HDMI to work on omap5

- Update phy supplies for beagle x15 beta board

- Use palmas-usb for on beagle x15 to start using the related
  driver that recently got merged

* tag 'omap-for-v4.3/fixes-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
  ARM: dts: fix omap2+ address translation for pbias
  ARM: dts: am57xx-beagle-x15: use palmas-usb for USB2
  ARM: omap2plus_defconfig: enable GPIO_PCA953X
  ARM: dts: omap5-uevm.dts: fix i2c5 pinctrl offsets
  ARM: OMAP2+: AM43XX: Enable autoidle for clks in am43xx_init_late
  ARM: dts: am57xx-beagle-x15: Update Phy supplies
  regulator: pbias: program pbias register offset in pbias driver
  ARM: omap2plus_defconfig: Enable MUSB DMA support
  ARM: DRA752: Add ID detect for ES2.0
  ARM: OMAP3: vc: fix 'or' always true warning
  ARM: OMAP2+: Fix booting if no timer parent clock is available
  ARM: OMAP2+: omap-device: fix race deferred probe of omap_hsmmc vs omap_device_late_init

Signed-off-by: Olof Johansson <olof@lixom.net>
8 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Linus Torvalds [Sun, 27 Sep 2015 01:05:23 +0000 (21:05 -0400)]
Merge git://git./linux/kernel/git/herbert/crypto-2.6

Pull crypto fixes from Herbert Xu:
 "This fixes the following issues:

   - check the return value of platform_get_irq as signed int in xgene.

   - skip adf_dev_restore on virtual functions in qat.

   - fix double-free with backlogged requests in marvell_cesa"

* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  hwrng: xgene - fix handling platform_get_irq
  crypto: qat - VF should never trigger SBR on PH
  crypto: marvell - properly handle CRYPTO_TFM_REQ_MAY_BACKLOG-flagged requests

8 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending
Linus Torvalds [Sun, 27 Sep 2015 01:02:42 +0000 (21:02 -0400)]
Merge git://git./linux/kernel/git/nab/target-pending

Pull SCSI target fixes from Nicholas Bellinger:
 "This includes a iser-target series from Jenny + Sagi @ Mellanox that
  addresses the few remaining active I/O shutdown bugs, along with a
  patch to support zero-copy for immediate data payloads that gives a
  nice performance improvement for small block WRITEs.

  Also included are some recent >= v4.2 regression bug-fixes.  The most
  notable is a RCU conversion regression for SPC-3 PR registrations, and
  recent removal of obsolete RFC-3720 markers that introduced a login
  regression bug with MSFT iSCSI initiators.

  Thanks to everyone who has been testing + reporting bugs for v4.x"

* git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending:
  iscsi-target: Avoid OFMarker + IFMarker negotiation
  target: Make TCM_WRITE_PROTECT failure honor D_SENSE bit
  target: Fix target_sense_desc_format NULL pointer dereference
  target: Propigate backend read-only to core_tpg_add_lun
  target: Fix PR registration + APTPL RCU conversion regression
  iser-target: Skip data copy if all the command data comes as immediate
  iser-target: Change the recv buffers posting logic
  iser-target: Fix pending connections handling in target stack shutdown sequnce
  iser-target: Remove np_ prefix from isert_np members
  iser-target: Remove unused variables
  iser-target: Put the reference on commands waiting for unsol data
  iser-target: remove command with state ISTATE_REMOVE

8 years agoMerge tag 'usb-4.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Linus Torvalds [Sun, 27 Sep 2015 01:00:28 +0000 (21:00 -0400)]
Merge tag 'usb-4.3-rc3' of git://git./linux/kernel/git/gregkh/usb

Pull USB fixes from Greg KH:
 "Here are some USB driver fixes for 4.3-rc3.

  There's the usual assortment of new device ids, combined with xhci and
  gadget driver fixes.  Full details in the shortlog.  All of these have
  been in linux-next with no reported problems"

* tag 'usb-4.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (34 commits)
  MAINTAINERS: remove amd5536udc USB gadget driver maintainer
  USB: whiteheat: fix potential null-deref at probe
  xhci: init command timeout timer earlier to avoid deleting it uninitialized
  xhci: change xhci 1.0 only restrictions to support xhci 1.1
  usb: xhci: exit early in xhci_setup_device() if we're halted or dying
  usb: xhci: stop everything on the first call to xhci_stop
  usb: xhci: Clear XHCI_STATE_DYING on start
  usb: xhci: lock mutex on xhci_stop
  xhci: Move xhci_pme_quirk() behind #ifdef CONFIG_PM
  xhci: give command abortion one more chance before killing xhci
  usb: Use the USB_SS_MULT() macro to get the burst multiplier.
  usb: dwc3: gadget: Fix BUG in RT config
  usb: musb: fix cppi channel teardown for isoch transfer
  usb: phy: isp1301: Export I2C module alias information
  usb: gadget: drop null test before destroy functions
  usb: gadget: dummy_hcd: in transfer(), return data sent, not limit
  usb: gadget: dummy_hcd: fix rescan logic for transfer
  usb: gadget: dummy_hcd: fix unneeded else-if condition
  usb: gadget: dummy_hcd: emulate sending zlp in packet logic
  usb: musb: dsps: fix polling in device-only mode
  ...

8 years agoMerge tag 'tty-4.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Linus Torvalds [Sun, 27 Sep 2015 00:58:38 +0000 (20:58 -0400)]
Merge tag 'tty-4.3-rc3' of git://git./linux/kernel/git/gregkh/tty

Pull serial driver fix from Greg KH:
 "Here is one serial driver fix for 4.3-rc3 that resolves a module
  loading issue due to splitting up of the 8250 driver into smaller
  pieces.  It's been in linux-next with no reported problems"

* tag 'tty-4.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  tty: serial: Add missing module license for 8250_base.ko

8 years agoMerge tag 'staging-4.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
Linus Torvalds [Sun, 27 Sep 2015 00:56:50 +0000 (20:56 -0400)]
Merge tag 'staging-4.3-rc3' of git://git./linux/kernel/git/gregkh/staging

Pull staging driver fixes from Greg KH:
 "Here are some tiny staging driver and documentation fixes for 4.3-rc3.

  All of these resolve reported issues that people have found and have
  been in the linux-next tree for a while with no problems"

* tag 'staging-4.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
  MAINTAINERS: Update email address for Martyn Welch
  staging: ion: fix corruption of ion_import_dma_buf
  staging: dgap: Remove myself from the MAINTAINERS file
  staging: most: Add dependency to HAS_IOMEM
  staging: unisys: remove reference of visorutil
  staging: unisys: visornic: handle error return from device registration
  staging: unisys: stop device registration before visorbus registration
  staging: unisys: visorbus: Unregister driver on error
  staging: unisys: visornic: Fix receive bytes statistics
  staging: unisys: unregister netdev when create debugfs fails
  staging: fbtft: replace master->setup() with spi_setup()
  staging: fbtft: fix 9-bit SPI support detection
  staging/lustre: change Lustre URLs and mailing list
  staging/android: Update ION TODO per LPC discussion
  Staging: most: MOST and MOSTCORE should depend on HAS_DMA
  staging: most: fix HDM_USB dependencies and build errors

8 years agoMerge tag 'driver-core-4.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sun, 27 Sep 2015 00:54:53 +0000 (20:54 -0400)]
Merge tag 'driver-core-4.3-rc3' of git://git./linux/kernel/git/gregkh/driver-core

Pull driver core fix from Greg KH:
 "Here is one driver core fix for 4.3-rc3 that resolves a reported oops"

* tag 'driver-core-4.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  cpu/cacheinfo: Fix teardown path

8 years agoMerge tag 'char-misc-4.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
Linus Torvalds [Sun, 27 Sep 2015 00:53:15 +0000 (20:53 -0400)]
Merge tag 'char-misc-4.3-rc3' of git://git./linux/kernel/git/gregkh/char-misc

Pull char/misc driver fixes from Greg KH:
 "Here's some tiny char and misc driver fixes that resolve some reported
  errors for 4.3-rc3.

  All of these have been in linux-next with no problems for a while"

* tag 'char-misc-4.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  extcon: Fix attached value returned by is_extcon_changed
  Drivers: hv: vmbus: fix init_vp_index() for reloading hv_netvsc
  mei: fix debugfs files leak on error path
  thunderbolt: Allow loading of module on recent Apple MacBooks with thunderbolt 2 controller

8 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Linus Torvalds [Sat, 26 Sep 2015 10:01:33 +0000 (06:01 -0400)]
Merge git://git./linux/kernel/git/davem/net

Pull networking fixes from David Miller:

 1) When we run a tap on netlink sockets, we have to copy mmap'd SKBs
    instead of cloning them.  From Daniel Borkmann.

 2) When converting classical BPF into eBPF, fix the setting of the
    source reg to BPF_REG_X.  From Tycho Andersen.

 3) Fix igmpv3/mldv2 report parsing in the bridge multicast code, from
    Linus Lussing.

 4) Fix dst refcounting for ipv6 tunnels, from Martin KaFai Lau.

 5) Set NLM_F_REPLACE flag properly when replacing ipv6 routes, from
    Roopa Prabhu.

 6) Add some new cxgb4 PCI device IDs, from Hariprasad Shenai.

 7) Fix headroom tests and SKB leaks in ipv6 fragmentation code, from
    Florian Westphal.

 8) Check DMA mapping errors in bna driver, from Ivan Vecera.

 9) Several 8139cp bug fixes (dev_kfree_skb_any in interrupt context,
    misclearing of interrupt status in TX timeout handler, etc.) from
    David Woodhouse.

10) In tipc, reset SKB header pointer after skb_linearize(), from Erik
    Hugne.

11) Fix autobind races et al. in netlink code, from Herbert Xu with
    help from Tejun Heo and others.

12) Missing SET_NETDEV_DEV in sunvnet driver, from Sowmini Varadhan.

13) Fix various races in timewait timer and reqsk_queue_hadh_req, from
    Eric Dumazet.

14) Fix array overruns in mac80211, from Johannes Berg and Dan
    Carpenter.

15) Fix data race in rhashtable_rehash_one(), from Dmitriy Vyukov.

16) Fix race between poll_one_napi and napi_disable, from Neil Horman.

17) Fix byte order in geneve tunnel port config, from John W Linville.

18) Fix handling of ARP replies over lightweight tunnels, from Jiri
    Benc.

19) We can loop when fib rule dumps cross multiple SKBs, fix from Wilson
    Kok and Roopa Prabhu.

20) Several reference count handling bug fixes in the PHY/MDIO layer
    from Russel King.

21) Fix lockdep splat in ppp_dev_uninit(), from Guillaume Nault.

22) Fix crash in icmp_route_lookup(), from David Ahern.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (116 commits)
  net: Fix panic in icmp_route_lookup
  net: update docbook comment for __mdiobus_register()
  ppp: fix lockdep splat in ppp_dev_uninit()
  net: via/Kconfig: GENERIC_PCI_IOMAP required if PCI not selected
  phy: marvell: add link partner advertised modes
  net: fix net_device refcounting
  phy: add phy_device_remove()
  phy: fixed-phy: properly validate phy in fixed_phy_update_state()
  net: fix phy refcounting in a bunch of drivers
  of_mdio: fix MDIO phy device refcounting
  phy: add proper phy struct device refcounting
  phy: fix mdiobus module safety
  net: dsa: fix of_mdio_find_bus() device refcount leak
  phy: fix of_mdio_find_bus() device refcount leak
  ip6_tunnel: Reduce log level in ip6_tnl_err() to debug
  ip6_gre: Reduce log level in ip6gre_err() to debug
  fib_rules: fix fib rule dumps across multiple skbs
  bnx2x: byte swap rss_key to comply to Toeplitz specs
  net: revert "net_sched: move tp->root allocation into fw_init()"
  lwtunnel: remove source and destination UDP port config option
  ...

8 years agonet: Fix panic in icmp_route_lookup
David Ahern [Thu, 24 Sep 2015 21:31:29 +0000 (15:31 -0600)]
net: Fix panic in icmp_route_lookup

Andrey reported a panic:

[ 7249.865507] BUG: unable to handle kernel pointer dereference at 000000b4
[ 7249.865559] IP: [<c16afeca>] icmp_route_lookup+0xaa/0x320
[ 7249.865598] *pdpt = 0000000030f7f001 *pde = 0000000000000000
[ 7249.865637] Oops: 0000 [#1]
...
[ 7249.866811] CPU: 0 PID: 0 Comm: swapper/0 Not tainted
4.3.0-999-generic #201509220155
[ 7249.866876] Hardware name: MSI MS-7250/MS-7250, BIOS 080014  08/02/2006
[ 7249.866916] task: c1a5ab00 ti: c1a52000 task.ti: c1a52000
[ 7249.866949] EIP: 0060:[<c16afeca>] EFLAGS: 00210246 CPU: 0
[ 7249.866981] EIP is at icmp_route_lookup+0xaa/0x320
[ 7249.867012] EAX: 00000000 EBX: f483ba48 ECX: 00000000 EDX: f2e18a00
[ 7249.867045] ESI: 000000c0 EDI: f483ba70 EBP: f483b9ec ESP: f483b974
[ 7249.867077]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[ 7249.867108] CR0: 8005003b CR2: 000000b4 CR3: 36ee07c0 CR4: 000006f0
[ 7249.867141] Stack:
[ 7249.867165]  320310ee 00000000 00000042 320310ee 00000000 c1aeca00
f3920240 f0c69180
[ 7249.867268]  f483ba04 f855058b a89b66cd f483ba44 f8962f4b 00000000
e659266c f483ba54
[ 7249.867361]  8004753c f483ba5c f8962f4b f2031140 000003c1 ffbd8fa0
c16b0e00 00000064
[ 7249.867448] Call Trace:
[ 7249.867494]  [<f855058b>] ? e1000_xmit_frame+0x87b/0xdc0 [e1000e]
[ 7249.867534]  [<f8962f4b>] ? tcp_in_window+0xeb/0xb10 [nf_conntrack]
[ 7249.867576]  [<f8962f4b>] ? tcp_in_window+0xeb/0xb10 [nf_conntrack]
[ 7249.867615]  [<c16b0e00>] ? icmp_send+0xa0/0x380
[ 7249.867648]  [<c16b102f>] icmp_send+0x2cf/0x380
[ 7249.867681]  [<f89c8126>] nf_send_unreach+0xa6/0xc0 [nf_reject_ipv4]
[ 7249.867714]  [<f89cd0da>] reject_tg+0x7a/0x9f [ipt_REJECT]
[ 7249.867746]  [<f88c29a7>] ipt_do_table+0x317/0x70c [ip_tables]
[ 7249.867780]  [<f895e0a6>] ? __nf_conntrack_find_get+0x166/0x3b0
[nf_conntrack]
[ 7249.867838]  [<f895eea8>] ? nf_conntrack_in+0x398/0x600 [nf_conntrack]
[ 7249.867889]  [<f84c0035>] iptable_filter_hook+0x35/0x80 [iptable_filter]
[ 7249.867933]  [<c16776a1>] nf_iterate+0x71/0x80
[ 7249.867970]  [<c1677715>] nf_hook_slow+0x65/0xc0
[ 7249.868002]  [<c1681811>] __ip_local_out_sk+0xc1/0xd0
[ 7249.868034]  [<c1680f30>] ? ip_forward_options+0x1a0/0x1a0
[ 7249.868066]  [<c1681836>] ip_local_out_sk+0x16/0x30
[ 7249.868097]  [<c1684054>] ip_send_skb+0x14/0x80
[ 7249.868129]  [<c16840f4>] ip_push_pending_frames+0x34/0x40
[ 7249.868163]  [<c16844a2>] ip_send_unicast_reply+0x282/0x310
[ 7249.868196]  [<c16a0863>] tcp_v4_send_reset+0x1b3/0x380
[ 7249.868227]  [<c16a1b63>] tcp_v4_rcv+0x323/0x990
[ 7249.868257]  [<c16776a1>] ? nf_iterate+0x71/0x80
[ 7249.868289]  [<c167dc2b>] ip_local_deliver_finish+0x8b/0x230
[ 7249.868322]  [<c167df4c>] ip_local_deliver+0x4c/0xa0
[ 7249.868353]  [<c167dba0>] ? ip_rcv_finish+0x390/0x390
[ 7249.868384]  [<c167d88c>] ip_rcv_finish+0x7c/0x390
[ 7249.868415]  [<c167e280>] ip_rcv+0x2e0/0x420
...

Prior to the VRF change the oif was not set in the flow struct, so the
VRF support should really have only added the vrf_master_ifindex lookup.

Fixes: 613d09b30f8b ("net: Use VRF device index for lookups on TX")
Cc: Andrey Melnikov <temnota.am@gmail.com>
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: update docbook comment for __mdiobus_register()
Russell King [Fri, 25 Sep 2015 10:56:56 +0000 (11:56 +0100)]
net: update docbook comment for __mdiobus_register()

Update the docbook comment for __mdiobus_register() to include the new
module owner argument.  This resolves a warning found by the 0-day
builder.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoMAINTAINERS: remove amd5536udc USB gadget driver maintainer
Greg Kroah-Hartman [Sat, 26 Sep 2015 03:45:27 +0000 (20:45 -0700)]
MAINTAINERS: remove amd5536udc USB gadget driver maintainer

Thomas can no longer work on the driver, so he asked me to mark the
MAINTAINER entry as "Orphan" with the hope that someone else would
someday pick it up.

Cc: Thomas Dahlmann <dahlmann.thomas@arcor.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoMerge branch 'for-4.3-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...
Linus Torvalds [Fri, 25 Sep 2015 23:20:55 +0000 (16:20 -0700)]
Merge branch 'for-4.3-fixes' of git://git./linux/kernel/git/tj/cgroup

Pull another cgroup fix from Tejun Heo:
 "The cgroup writeback support got inadvertently enabled for traditional
  hierarchies revealing two regressions which are currently being worked
  on.  It shouldn't have been enabled on traditional hierarchies, so
  disable it on them.  This is enough to make the regressions go away
  for people who aren't experimenting with cgroup"

* 'for-4.3-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  cgroup, writeback: don't enable cgroup writeback on traditional hierarchies

8 years agoppp: fix lockdep splat in ppp_dev_uninit()
Guillaume Nault [Thu, 24 Sep 2015 10:54:01 +0000 (12:54 +0200)]
ppp: fix lockdep splat in ppp_dev_uninit()

ppp_dev_uninit() locks all_ppp_mutex while under rtnl mutex protection.
ppp_create_interface() must then lock these mutexes in that same order
to avoid possible deadlock.

[  120.880011] ======================================================
[  120.880011] [ INFO: possible circular locking dependency detected ]
[  120.880011] 4.2.0 #1 Not tainted
[  120.880011] -------------------------------------------------------
[  120.880011] ppp-apitest/15827 is trying to acquire lock:
[  120.880011]  (&pn->all_ppp_mutex){+.+.+.}, at: [<ffffffffa0145f56>] ppp_dev_uninit+0x64/0xb0 [ppp_generic]
[  120.880011]
[  120.880011] but task is already holding lock:
[  120.880011]  (rtnl_mutex){+.+.+.}, at: [<ffffffff812e4255>] rtnl_lock+0x12/0x14
[  120.880011]
[  120.880011] which lock already depends on the new lock.
[  120.880011]
[  120.880011]
[  120.880011] the existing dependency chain (in reverse order) is:
[  120.880011]
[  120.880011] -> #1 (rtnl_mutex){+.+.+.}:
[  120.880011]        [<ffffffff81073a6f>] lock_acquire+0xcf/0x10e
[  120.880011]        [<ffffffff813ab18a>] mutex_lock_nested+0x56/0x341
[  120.880011]        [<ffffffff812e4255>] rtnl_lock+0x12/0x14
[  120.880011]        [<ffffffff812d9d94>] register_netdev+0x11/0x27
[  120.880011]        [<ffffffffa0147b17>] ppp_ioctl+0x289/0xc98 [ppp_generic]
[  120.880011]        [<ffffffff8113b367>] do_vfs_ioctl+0x4ea/0x532
[  120.880011]        [<ffffffff8113b3fd>] SyS_ioctl+0x4e/0x7d
[  120.880011]        [<ffffffff813ad7d7>] entry_SYSCALL_64_fastpath+0x12/0x6f
[  120.880011]
[  120.880011] -> #0 (&pn->all_ppp_mutex){+.+.+.}:
[  120.880011]        [<ffffffff8107334e>] __lock_acquire+0xb07/0xe76
[  120.880011]        [<ffffffff81073a6f>] lock_acquire+0xcf/0x10e
[  120.880011]        [<ffffffff813ab18a>] mutex_lock_nested+0x56/0x341
[  120.880011]        [<ffffffffa0145f56>] ppp_dev_uninit+0x64/0xb0 [ppp_generic]
[  120.880011]        [<ffffffff812d5263>] rollback_registered_many+0x19e/0x252
[  120.880011]        [<ffffffff812d5381>] rollback_registered+0x29/0x38
[  120.880011]        [<ffffffff812d53fa>] unregister_netdevice_queue+0x6a/0x77
[  120.880011]        [<ffffffffa0146a94>] ppp_release+0x42/0x79 [ppp_generic]
[  120.880011]        [<ffffffff8112d9f6>] __fput+0xec/0x192
[  120.880011]        [<ffffffff8112dacc>] ____fput+0x9/0xb
[  120.880011]        [<ffffffff8105447a>] task_work_run+0x66/0x80
[  120.880011]        [<ffffffff81001801>] prepare_exit_to_usermode+0x8c/0xa7
[  120.880011]        [<ffffffff81001900>] syscall_return_slowpath+0xe4/0x104
[  120.880011]        [<ffffffff813ad931>] int_ret_from_sys_call+0x25/0x9f
[  120.880011]
[  120.880011] other info that might help us debug this:
[  120.880011]
[  120.880011]  Possible unsafe locking scenario:
[  120.880011]
[  120.880011]        CPU0                    CPU1
[  120.880011]        ----                    ----
[  120.880011]   lock(rtnl_mutex);
[  120.880011]                                lock(&pn->all_ppp_mutex);
[  120.880011]                                lock(rtnl_mutex);
[  120.880011]   lock(&pn->all_ppp_mutex);
[  120.880011]
[  120.880011]  *** DEADLOCK ***

Fixes: 8cb775bc0a34 ("ppp: fix device unregistration upon netns deletion")
Reported-by: Sedat Dilek <sedat.dilek@gmail.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: via/Kconfig: GENERIC_PCI_IOMAP required if PCI not selected
Sudip Mukherjee [Thu, 24 Sep 2015 10:16:53 +0000 (15:46 +0530)]
net: via/Kconfig: GENERIC_PCI_IOMAP required if PCI not selected

The builds of allmodconfig of avr32 is failing with:

drivers/net/ethernet/via/via-rhine.c:1098:2: error: implicit declaration
of function 'pci_iomap' [-Werror=implicit-function-declaration]
drivers/net/ethernet/via/via-rhine.c:1119:2: error: implicit declaration
of function 'pci_iounmap' [-Werror=implicit-function-declaration]

The generic empty pci_iomap and pci_iounmap is used only if CONFIG_PCI
is not defined and CONFIG_GENERIC_PCI_IOMAP is defined.

Add GENERIC_PCI_IOMAP in the dependency list for VIA_RHINE as we are
getting build failure when CONFIG_PCI and CONFIG_GENERIC_PCI_IOMAP both
are not defined.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agophy: marvell: add link partner advertised modes
Russell King [Wed, 23 Sep 2015 23:07:17 +0000 (00:07 +0100)]
phy: marvell: add link partner advertised modes

Read the standard link partner advertisment registers and store it in
phydev->lp_advertising, so ethtool can report this information to
userspace via ethtool.  Zero it as per genphy if autonegotiation is
disabled.  Tested with a Marvell 88E1512 PHY.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoMerge branch 'for-linus-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mason...
Linus Torvalds [Fri, 25 Sep 2015 19:08:41 +0000 (12:08 -0700)]
Merge branch 'for-linus-4.3' of git://git./linux/kernel/git/mason/linux-btrfs

Pull btrfs fixes from Chris Mason:
 "This is an assorted set I've been queuing up:

  Jeff Mahoney tracked down a tricky one where we ended up starting IO
  on the wrong mapping for special files in btrfs_evict_inode.  A few
  people reported this one on the list.

  Filipe found (and provided a test for) a difficult bug in reading
  compressed extents, and Josef fixed up some quota record keeping with
  snapshot deletion.  Chandan killed off an accounting bug during DIO
  that lead to WARN_ONs as we freed inodes"

* 'for-linus-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  Btrfs: keep dropped roots in cache until transaction commit
  Btrfs: Direct I/O: Fix space accounting
  btrfs: skip waiting on ordered range for special files
  Btrfs: fix read corruption of compressed and shared extents
  Btrfs: remove unnecessary locking of cleaner_mutex to avoid deadlock
  Btrfs: don't initialize a space info as full to prevent ENOSPC

8 years agoMerge tag 'nfs-for-4.3-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
Linus Torvalds [Fri, 25 Sep 2015 18:33:52 +0000 (11:33 -0700)]
Merge tag 'nfs-for-4.3-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client bugfixes from Trond Myklebust:
 "Highlights include:

  Stable patches:
   - fix v4.2 SEEK on files over 2 gigs
   - Fix a layout segment reference leak when pNFS I/O falls back to inband I/O.
   - Fix recovery of recalled read delegations

  Bugfixes:
   - Fix a case where NFSv4 fails to send CLOSE after a server reboot
   - Fix sunrpc to wait for connections to complete before retrying
   - Fix sunrpc races between transport connect/disconnect and shutdown
   - Fix an infinite loop when layoutget fail with BAD_STATEID
   - nfs/filelayout: Fix NULL reference caused by double freeing of fh_array
   - Fix a bogus WARN_ON_ONCE() in O_DIRECT when layout commit_through_mds is set
   - Fix layoutreturn/close ordering issues"

* tag 'nfs-for-4.3-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  NFS41: make close wait for layoutreturn
  NFS: Skip checking ds_cinfo.buckets when lseg's commit_through_mds is set
  NFSv4.x/pnfs: Don't try to recover stateids twice in layoutget
  NFSv4: Recovery of recalled read delegations is broken
  NFS: Fix an infinite loop when layoutget fail with BAD_STATEID
  NFS: Do cleanup before resetting pageio read/write to mds
  SUNRPC: xs_sock_mark_closed() does not need to trigger socket autoclose
  SUNRPC: Lock the transport layer on shutdown
  nfs/filelayout: Fix NULL reference caused by double freeing of fh_array
  SUNRPC: Ensure that we wait for connections to complete before retrying
  SUNRPC: drop null test before destroy functions
  nfs: fix v4.2 SEEK on files over 2 gigs
  SUNRPC: Fix races between socket connection and destroy code
  nfs: fix pg_test page count calculation
  Failing to send a CLOSE if file is opened WRONLY and server reboots on a 4.x mount

8 years agoMerge tag 'sound-4.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai...
Linus Torvalds [Fri, 25 Sep 2015 18:25:30 +0000 (11:25 -0700)]
Merge tag 'sound-4.3-rc3' of git://git./linux/kernel/git/tiwai/sound

Pull sound fixes from Takashi Iwai:
 "This ended up with a larger set of fixes than wished, unfortunately.

  As diffstat shows, the majority of changes are for various ASoC
  drivers (Realtek, Wolfson codec drivers, etc), in addition to a couple
  of HD-audio regression fixes.  All these are reasonably small and
  nothing to scare much"

* tag 'sound-4.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: (29 commits)
  ALSA: hda - Disable power_save_node for Thinkpads
  ALSA: hda/tegra - async probe for avoiding module loading deadlock
  ASoC: rt5645: Prevent the pop sound in case of playback and the jack is plugging
  ASoC: rt5645: Increase the delay time to remove the pop sound
  ASoC: rt5645: Use the type SOC_DAPM_SINGLE_AUTODISABLE to prevent the weird sound in runtime of power up
  ASoC: pxa: pxa2xx-ac97: fix dma requestor lines
  MAINTAINERS: Update website and git repo for Wolfson Microelectronics
  ASoC: fsl_ssi: Fix checking of dai format for AC97 mode
  ASoC: wm0010: fix error path
  ASoC: wm0010: fix memory leak
  ASoC: wm8960: correct the max register value of mic boost pga
  ASoC: wm8962: remove 64k sample rate support
  ASoC: davinci-mcasp: Fix devm_kasprintf format string
  ASoC: fix broken pxa SoC support
  ASoC: davinci-mcasp: Set .symmetric_rates = 1 in snd_soc_dai_driver
  ASoC: au1x: psc-i2s: Fix unused variable 'ret' warning
  ASoC: SPEAr: Make SND_SPEAR_SOC select SND_SOC_GENERIC_DMAENGINE_PCM
  ASoC: mediatek: Increase periods_min in capture
  ASoC: davinci-mcasp: Revise the FIFO threshold calculation
  ASoC: wm8960: correct gain value for input PGA and add microphone PGA
  ...

8 years agoMerge tag 'pci-v4.3-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
Linus Torvalds [Fri, 25 Sep 2015 18:16:53 +0000 (11:16 -0700)]
Merge tag 'pci-v4.3-fixes-1' of git://git./linux/kernel/git/helgaas/pci

Pull PCI fixes from Bjorn Helgaas:
 "These are fixes for things we merged for v4.3 (VPD, MSI, and bridge
  window management), and a new Renesas R8A7794 SoC device ID.

  Details:

  Resource management:
   - Revert pci_read_bridge_bases() unification (Bjorn Helgaas)
   - Clear IORESOURCE_UNSET when clipping a bridge window (Bjorn
     Helgaas)

  MSI:
   - Fix MSI IRQ domains for VFs on virtual buses (Alex Williamson)

  Renesas R-Car host bridge driver:
   - Add R8A7794 support (Sergei Shtylyov)

  Miscellaneous:
   - Fix devfn for VPD access through function 0 (Alex Williamson)
   - Use function 0 VPD only for identical functions (Alex Williamson)"

* tag 'pci-v4.3-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
  PCI: rcar: Add R8A7794 support
  PCI: Use function 0 VPD for identical functions, regular VPD for others
  PCI: Fix devfn for VPD access through function 0
  PCI/MSI: Fix MSI IRQ domains for VFs on virtual buses
  PCI: Clear IORESOURCE_UNSET when clipping a bridge window
  PCI: Revert "PCI: Call pci_read_bridge_bases() from core instead of arch code"

8 years agoMerge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Linus Torvalds [Fri, 25 Sep 2015 17:51:40 +0000 (10:51 -0700)]
Merge tag 'for-linus' of git://git./virt/kvm/kvm

Pull KVM fixes from Paolo Bonzini:
 "AMD fixes for bugs introduced in the 4.2 merge window, and a few PPC
  bug fixes too"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: disable halt_poll_ns as default for s390x
  KVM: x86: fix off-by-one in reserved bits check
  KVM: x86: use correct page table format to check nested page table reserved bits
  KVM: svm: do not call kvm_set_cr0 from init_vmcb
  KVM: x86: trap AMD MSRs for the TSeg base and mask
  KVM: PPC: Book3S: Take the kvm->srcu lock in kvmppc_h_logical_ci_load/store()
  KVM: PPC: Book3S HV: Pass the correct trap argument to kvmhv_commence_exit
  KVM: PPC: Book3S HV: Fix handling of interrupted VCPUs
  kvm: svm: reset mmu on VCPU reset

8 years agoMerge tag 'powerpc-4.3-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...
Linus Torvalds [Fri, 25 Sep 2015 17:11:26 +0000 (10:11 -0700)]
Merge tag 'powerpc-4.3-3' of git://git./linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
 - Wire up sys_membarrier()
 - cxl: Fix lockdep warning while creating afu_err_buff from Vaibhav

* tag 'powerpc-4.3-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  cxl: Fix lockdep warning while creating afu_err_buff attribute
  powerpc: Wire up sys_membarrier()

8 years agoKVM: disable halt_poll_ns as default for s390x
David Hildenbrand [Fri, 18 Sep 2015 10:34:53 +0000 (12:34 +0200)]
KVM: disable halt_poll_ns as default for s390x

We observed some performance degradation on s390x with dynamic
halt polling. Until we can provide a proper fix, let's enable
halt_poll_ns as default only for supported architectures.

Architectures are now free to set their own halt_poll_ns
default value.

Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoKVM: x86: fix off-by-one in reserved bits check
Paolo Bonzini [Tue, 22 Sep 2015 08:15:59 +0000 (10:15 +0200)]
KVM: x86: fix off-by-one in reserved bits check

29ecd6601904 ("KVM: x86: avoid uninitialized variable warning",
2015-09-06) introduced a not-so-subtle problem, which probably
escaped review because it was not part of the patch context.

Before the patch, leaf was always equal to iterator.level.  After,
it is equal to iterator.level - 1 in the call to is_shadow_zero_bits_set,
and when is_shadow_zero_bits_set does another "-1" the check on
reserved bits becomes incorrect.  Using "iterator.level" in the call
fixes this call trace:

WARNING: CPU: 2 PID: 17000 at arch/x86/kvm/mmu.c:3385 handle_mmio_page_fault.part.93+0x1a/0x20 [kvm]()
Modules linked in: tun sha256_ssse3 sha256_generic drbg binfmt_misc ipv6 vfat fat fuse dm_crypt dm_mod kvm_amd kvm crc32_pclmul aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd fam15h_power amd64_edac_mod k10temp edac_core amdkfd amd_iommu_v2 radeon acpi_cpufreq
[...]
Call Trace:
  dump_stack+0x4e/0x84
  warn_slowpath_common+0x95/0xe0
  warn_slowpath_null+0x1a/0x20
  handle_mmio_page_fault.part.93+0x1a/0x20 [kvm]
  tdp_page_fault+0x231/0x290 [kvm]
  ? emulator_pio_in_out+0x6e/0xf0 [kvm]
  kvm_mmu_page_fault+0x36/0x240 [kvm]
  ? svm_set_cr0+0x95/0xc0 [kvm_amd]
  pf_interception+0xde/0x1d0 [kvm_amd]
  handle_exit+0x181/0xa70 [kvm_amd]
  ? kvm_arch_vcpu_ioctl_run+0x68b/0x1730 [kvm]
  kvm_arch_vcpu_ioctl_run+0x6f6/0x1730 [kvm]
  ? kvm_arch_vcpu_ioctl_run+0x68b/0x1730 [kvm]
  ? preempt_count_sub+0x9b/0xf0
  ? mutex_lock_killable_nested+0x26f/0x490
  ? preempt_count_sub+0x9b/0xf0
  kvm_vcpu_ioctl+0x358/0x710 [kvm]
  ? __fget+0x5/0x210
  ? __fget+0x101/0x210
  do_vfs_ioctl+0x2f4/0x560
  ? __fget_light+0x29/0x90
  SyS_ioctl+0x4c/0x90
  entry_SYSCALL_64_fastpath+0x16/0x73
---[ end trace 37901c8686d84de6 ]---

Reported-by: Borislav Petkov <bp@alien8.de>
Tested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoKVM: x86: use correct page table format to check nested page table reserved bits
Paolo Bonzini [Tue, 22 Sep 2015 21:02:14 +0000 (23:02 +0200)]
KVM: x86: use correct page table format to check nested page table reserved bits

Intel CPUID on AMD host or vice versa is a weird case, but it can
happen.  Handle it by checking the host CPU vendor instead of the
guest's in reset_tdp_shadow_zero_bits_mask.  For speed, the
check uses the fact that Intel EPT has an X (executable) bit while
AMD NPT has NX.

Reported-by: Borislav Petkov <bp@alien8.de>
Tested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoKVM: svm: do not call kvm_set_cr0 from init_vmcb
Paolo Bonzini [Mon, 21 Sep 2015 05:46:55 +0000 (07:46 +0200)]
KVM: svm: do not call kvm_set_cr0 from init_vmcb

kvm_set_cr0 may want to call kvm_zap_gfn_range and thus access the
memslots array (SRCU protected).  Using a mini SRCU critical section
is ugly, and adding it to kvm_arch_vcpu_create doesn't work because
the VMX vcpu_create callback calls synchronize_srcu.

Fixes this lockdep splat:

===============================
[ INFO: suspicious RCU usage. ]
4.3.0-rc1+ #1 Not tainted
-------------------------------
include/linux/kvm_host.h:488 suspicious rcu_dereference_check() usage!

other info that might help us debug this:
rcu_scheduler_active = 1, debug_locks = 0
1 lock held by qemu-system-i38/17000:
 #0:  (&(&kvm->mmu_lock)->rlock){+.+...}, at: kvm_zap_gfn_range+0x24/0x1a0 [kvm]

[...]
Call Trace:
 dump_stack+0x4e/0x84
 lockdep_rcu_suspicious+0xfd/0x130
 kvm_zap_gfn_range+0x188/0x1a0 [kvm]
 kvm_set_cr0+0xde/0x1e0 [kvm]
 init_vmcb+0x760/0xad0 [kvm_amd]
 svm_create_vcpu+0x197/0x250 [kvm_amd]
 kvm_arch_vcpu_create+0x47/0x70 [kvm]
 kvm_vm_ioctl+0x302/0x7e0 [kvm]
 ? __lock_is_held+0x51/0x70
 ? __fget+0x101/0x210
 do_vfs_ioctl+0x2f4/0x560
 ? __fget_light+0x29/0x90
 SyS_ioctl+0x4c/0x90
 entry_SYSCALL_64_fastpath+0x16/0x73

Reported-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
8 years agoiscsi-target: Avoid OFMarker + IFMarker negotiation
Nicholas Bellinger [Wed, 23 Sep 2015 05:32:14 +0000 (22:32 -0700)]
iscsi-target: Avoid OFMarker + IFMarker negotiation

This patch fixes a v4.2+ regression introduced by commit c04a6091
that removed support for obsolete sync-and-steering markers usage
as originally defined in RFC-3720.

The regression would involve attempting to send OFMarker=No +
IFMarker=No keys during opertional negotiation login phase,
including when initiators did not actually propose these keys.

The result for MSFT iSCSI initiators would be random junk in
TCP stream after the last successful login request was been sent
signaling the move to full feature phase (FFP) operation.

To address this bug, go ahead and avoid negotiating these keys
by default unless the initiator explicitly proposes them, but
still respond to them with 'No' if they are proposed.

Reported-by: Dragan Milivojević <galileo@pkm-inc.com>
Bisected-by: Christophe Vu-Brugier <cvubrugier@fastmail.fm>
Tested-by: Christophe Vu-Brugier <cvubrugier@fastmail.fm>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
8 years agotarget: Make TCM_WRITE_PROTECT failure honor D_SENSE bit
Nicholas Bellinger [Thu, 17 Sep 2015 03:23:53 +0000 (20:23 -0700)]
target: Make TCM_WRITE_PROTECT failure honor D_SENSE bit

This patch changes transport_lookup_cmd_lun() to obtain
se_lun->lun_ref + se_cmd->se_device rcu_dereference during
TCM_WRITE_PROTECT -> CHECK_CONDITION failure status.

Do this to ensure the active control D_SENSE mode page bit
is being honored.

Reported-by: Sagi Grimberg <sagig@mellanox.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
8 years agotarget: Fix target_sense_desc_format NULL pointer dereference
Nicholas Bellinger [Wed, 16 Sep 2015 06:07:45 +0000 (23:07 -0700)]
target: Fix target_sense_desc_format NULL pointer dereference

This patch allows target_sense_desc_format() to be called without a
valid se_device pointer, which can occur during an early exception
ahead of transport_lookup_cmd_lun() setting up se_cmd->se_device.

This addresses a v4.3-rc1 specific NULL pointer dereference
regression introduced by commit 4e4937e8.

Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
8 years agotarget: Propigate backend read-only to core_tpg_add_lun
Nicholas Bellinger [Wed, 16 Sep 2015 00:27:35 +0000 (17:27 -0700)]
target: Propigate backend read-only to core_tpg_add_lun

This patch adds a DF_READ_ONLY flag that is used by IBLOCK to
signal when a backend has been set to read-only mode, in order
to propigate read-only status up to core_tpg_add_lun() for all
future LUN fabric exports.

With this is place, existing emulation for reporting read-only
in spc_emulate_modesense() and normal transport_lookup_cmd_lun()
TCM_WRITE_PROTECTED status checking just works as expected.

Reported-by: Joeue Deng <joeue404@gmail.com>
Reported-by: Andy Grover <agrover@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>