From: Vadim Sukhomlinov <[email protected]>
commit db4d8cb9c9f2af71c4d087817160d866ed572cc9 upstream
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: [email protected]
Signed-off-by: Vadim Sukhomlinov <[email protected]>
[dianders: resolved merge conflicts with mainline]
Signed-off-by: Douglas Anderson <[email protected]>
Reviewed-by: Jarkko Sakkinen <[email protected]>
Signed-off-by: Jarkko Sakkinen <[email protected]>
---
drivers/char/tpm/tpm-chip.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 0eca20c5a80c..dcf5bb153495 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -158,12 +158,13 @@ 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);
tpm2_shutdown(chip, TPM2_SU_CLEAR);
chip->ops = NULL;
- up_write(&chip->ops_sem);
}
+ chip->ops = NULL;
+ up_write(&chip->ops_sem);
return 0;
}
--
2.20.1
