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| author | Vadim Sukhomlinov <sukhomlinov@google.com> | 2019-06-10 15:01:18 -0700 |
|---|---|---|
| committer | Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> | 2019-06-24 23:57:49 +0300 |
| commit | db4d8cb9c9f2af71c4d087817160d866ed572cc9 (patch) | |
| tree | 68e51b41ab2b38d496c52fa70edc71391f44ac3a /drivers/char | |
| parent | 6b0326190205603fa9b7fe1b05ff1f8fb22de266 (diff) | |
| download | linux-0-day-db4d8cb9c9f2af71c4d087817160d866ed572cc9.tar.gz linux-0-day-db4d8cb9c9f2af71c4d087817160d866ed572cc9.tar.xz | |
tpm: Fix TPM 1.2 Shutdown sequence to prevent future TPM operations
TPM 2.0 Shutdown involve sending TPM2_Shutdown to TPM chip and disabling
future TPM operations. TPM 1.2 behavior was different, future TPM
operations weren't disabled, causing rare issues. This patch ensures
that future TPM operations are disabled.
Fixes: d1bd4a792d39 ("tpm: Issue a TPM2_Shutdown for TPM2 devices.")
Cc: stable@vger.kernel.org
Signed-off-by: Vadim Sukhomlinov <sukhomlinov@google.com>
[dianders: resolved merge conflicts with mainline]
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/tpm/tpm-chip.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c index 90325e1749fb6..d47ad10a35fe3 100644 --- a/drivers/char/tpm/tpm-chip.c +++ b/drivers/char/tpm/tpm-chip.c @@ -289,15 +289,15 @@ static int tpm_class_shutdown(struct device *dev) { struct tpm_chip *chip = container_of(dev, struct tpm_chip, dev); + down_write(&chip->ops_sem); if (chip->flags & TPM_CHIP_FLAG_TPM2) { - down_write(&chip->ops_sem); if (!tpm_chip_start(chip)) { tpm2_shutdown(chip, TPM2_SU_CLEAR); tpm_chip_stop(chip); } - chip->ops = NULL; - up_write(&chip->ops_sem); } + chip->ops = NULL; + up_write(&chip->ops_sem); return 0; } |