Messages in this thread Patch in this message | | | From | Jarkko Sakkinen <> | Subject | [PATCH] tpm: fix crash in tpm_tis | Date | Thu, 7 Apr 2016 15:56:10 +0300 |
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rmmod crashes the driver because tpm_chip_unregister() already sets ops to NULL. Release ops in tpm_dev_release() so that tpm2_shutdown() can be cleanly executed and also because it is symmetrical where they are allocated (in tpmm_chip_alloc()).
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 | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c index f62c851..5241bc4 100644 --- a/drivers/char/tpm/tpm-chip.c +++ b/drivers/char/tpm/tpm-chip.c @@ -127,6 +127,11 @@ static void tpm_dev_release(struct device *dev) idr_remove(&dev_nums_idr, chip->dev_num); mutex_unlock(&idr_lock); + /* Make the driver uncallable. */ + down_write(&chip->ops_sem); + chip->ops = NULL; + up_write(&chip->ops_sem); + kfree(chip); } @@ -266,11 +271,6 @@ static void tpm_del_char_device(struct tpm_chip *chip) mutex_lock(&idr_lock); idr_replace(&dev_nums_idr, NULL, chip->dev_num); mutex_unlock(&idr_lock); - - /* Make the driver uncallable. */ - down_write(&chip->ops_sem); - chip->ops = NULL; - up_write(&chip->ops_sem); } static int tpm1_chip_register(struct tpm_chip *chip) -- 1.9.1
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