From 036bb38ffb3e4c92361108f324364b0341cd9e31 Mon Sep 17 00:00:00 2001 From: Jason Gunthorpe Date: Wed, 25 Nov 2015 14:05:31 -0700 Subject: [PATCH] tpm_tis: Ensure interrupts are disabled when the driver starts This should be done very early, before anything could possibly cause the TPM to generate an interrupt. If the IRQ line is shared with another driver causing an interrupt before setting up our handler will be very bad. Signed-off-by: Jason Gunthorpe Reviewed-by: Jarkko Sakkinen Tested-by: Jarkko Sakkinen Tested-by: Martin Wilck Tested-by: Scot Doyle Signed-off-by: Jarkko Sakkinen Acked-by: Peter Huewe --- drivers/char/tpm/tpm_tis.c | 20 +++++++++----------- 1 file changed, 9 insertions(+), 11 deletions(-) diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c index f10a107614b4..513f30efd9d3 100644 --- a/drivers/char/tpm/tpm_tis.c +++ b/drivers/char/tpm/tpm_tis.c @@ -677,6 +677,15 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info, goto out_err; } + /* Take control of the TPM's interrupt hardware and shut it off */ + intmask = ioread32(chip->vendor.iobase + + TPM_INT_ENABLE(chip->vendor.locality)); + intmask |= TPM_INTF_CMD_READY_INT | TPM_INTF_LOCALITY_CHANGE_INT | + TPM_INTF_DATA_AVAIL_INT | TPM_INTF_STS_VALID_INT; + intmask &= ~TPM_GLOBAL_INT_ENABLE; + iowrite32(intmask, + chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor.locality)); + if (request_locality(chip, 0) != 0) { rc = -ENODEV; goto out_err; @@ -735,17 +744,6 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info, init_waitqueue_head(&chip->vendor.read_queue); init_waitqueue_head(&chip->vendor.int_queue); - intmask = - ioread32(chip->vendor.iobase + - TPM_INT_ENABLE(chip->vendor.locality)); - - intmask |= TPM_INTF_CMD_READY_INT - | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT - | TPM_INTF_STS_VALID_INT; - - iowrite32(intmask, - chip->vendor.iobase + - TPM_INT_ENABLE(chip->vendor.locality)); if (interrupts) chip->vendor.irq = tpm_info->irq; if (interrupts && !chip->vendor.irq) { -- 2.20.1