Messages in this thread Patch in this message | | | From | Jarkko Sakkinen <> | Subject | [PATCH v2] tpm: fix crash in tpm_tis deinitialization | Date | Wed, 13 Apr 2016 10:17:01 +0300 |
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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.
v2: make sending shutdown command atomic with nulling ops
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Fixes: 4d3eac5e156a ("tpm: Provide strong locking for device removal") --- drivers/char/tpm/tpm-chip.c | 3 +++ drivers/char/tpm/tpm_crb.c | 3 --- drivers/char/tpm/tpm_tis.c | 3 --- 3 files changed, 3 insertions(+), 6 deletions(-)
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c index f62c851..2642cca 100644 --- a/drivers/char/tpm/tpm-chip.c +++ b/drivers/char/tpm/tpm-chip.c @@ -361,6 +361,9 @@ void tpm_chip_unregister(struct tpm_chip *chip) if (!(chip->flags & TPM_CHIP_FLAG_REGISTERED)) return; + if (chip->flags & TPM_CHIP_FLAG_TPM2) + tpm2_shutdown(chip, TPM2_SU_CLEAR); + if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) sysfs_remove_link(&chip->dev.parent->kobj, "ppi"); diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c index 20155d5..c31b5a7 100644 --- a/drivers/char/tpm/tpm_crb.c +++ b/drivers/char/tpm/tpm_crb.c @@ -341,9 +341,6 @@ 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 1e45e73..a6b2d46 100644 --- a/drivers/char/tpm/tpm_tis.c +++ b/drivers/char/tpm/tpm_tis.c @@ -681,9 +681,6 @@ static void tpm_tis_remove(struct tpm_chip *chip) struct priv_data *priv = dev_get_drvdata(&chip->dev); void __iomem *reg = priv->iobase + TPM_INT_ENABLE(priv->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, priv->locality, 1); } -- 2.7.4
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