From: Jarkko Sakkinen Date: Mon, 11 Apr 2016 11:20:57 +0000 (+0300) Subject: tpm: fix crash in tpm_tis deinitialization X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=dcbeab194645486dc482b49b44ef5b8634153034;p=linux-beck.git tpm: fix crash in tpm_tis deinitialization rmmod crashes the driver because tpm_chip_unregister() already sets ops to NULL. This commit fixes the issue by moving tpm2_shutdown() to tpm_chip_unregister(). This commit is also cleanup because it removes duplicate code from tpm_crb and tpm_tis to the core. Fixes: 4d3eac5e156a ("tpm: Provide strong locking for device removal") Signed-off-by: Jarkko Sakkinen Reviewed-by: Jason Gunthorpe --- diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c index f62c8518cd68..5bc530ccbb86 100644 --- a/drivers/char/tpm/tpm-chip.c +++ b/drivers/char/tpm/tpm-chip.c @@ -269,6 +269,7 @@ static void tpm_del_char_device(struct tpm_chip *chip) /* Make the driver uncallable. */ down_write(&chip->ops_sem); + tpm2_shutdown(chip, TPM2_SU_CLEAR); chip->ops = NULL; up_write(&chip->ops_sem); } diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c index 5fc0e7c64daa..e42266589ce6 100644 --- a/drivers/char/tpm/tpm2-cmd.c +++ b/drivers/char/tpm/tpm2-cmd.c @@ -773,7 +773,6 @@ void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type) dev_warn(&chip->dev, "transmit returned %d while stopping the TPM", rc); } -EXPORT_SYMBOL_GPL(tpm2_shutdown); /* * tpm2_calc_ordinal_duration() - maximum duration for a command diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c index a12b31940344..ec734de87b76 100644 --- a/drivers/char/tpm/tpm_crb.c +++ b/drivers/char/tpm/tpm_crb.c @@ -344,9 +344,6 @@ static int crb_acpi_remove(struct acpi_device *device) struct device *dev = &device->dev; struct tpm_chip *chip = dev_get_drvdata(dev); - if (chip->flags & TPM_CHIP_FLAG_TPM2) - tpm2_shutdown(chip, TPM2_SU_CLEAR); - tpm_chip_unregister(chip); return 0; diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c index 18236f66c084..0b0d44f9aaf2 100644 --- a/drivers/char/tpm/tpm_tis.c +++ b/drivers/char/tpm/tpm_tis.c @@ -653,9 +653,6 @@ static void tpm_tis_remove(struct tpm_chip *chip) void __iomem *reg = chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor.locality); - if (chip->flags & TPM_CHIP_FLAG_TPM2) - tpm2_shutdown(chip, TPM2_SU_CLEAR); - iowrite32(~TPM_GLOBAL_INT_ENABLE & ioread32(reg), reg); release_locality(chip, chip->vendor.locality, 1); }