PCI: Fix unaligned accesses in VC code
authorDavid Miller <davem@davemloft.net>
Sun, 19 Jun 2016 06:52:25 +0000 (23:52 -0700)
committerBjorn Helgaas <bhelgaas@google.com>
Mon, 20 Jun 2016 18:24:20 +0000 (13:24 -0500)
commitef0dab4aae14e25efddf1577736f8450132800c5
tree6e35085e725dd7ba3a40d0fad903d4e55c1fd828
parentaf8c34ce6ae32addda3788d54a7e340cad22516b
PCI: Fix unaligned accesses in VC code

The save/restore buffers for VC state is first composed of a 2-byte control
register, then a bunch of 4-byte words.

This causes unaligned accesses which trap on platform such as sparc.

This is easy to fix by simply moving the buffer pointer forward by 4 bytes
instead of 2 after dealing with the control register.  The length
adjustment needs to be changed likewise as well.

Fixes: 5f8fc43217a0 ("PCI: Include pci/pcie/Kconfig directly from pci/Kconfig")
Reported-by: Meelis Roos <mroos@linux.ee>
Reported-by: Anatoly Pugachev <matorola@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org # v4.6+
drivers/pci/vc.c