On Mon, Dec 20, 2021 at 08:05:58PM -0500, Stefan Berger wrote:
> diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
> index ddaeceb7e109..4cb908349b31 100644
> +++ b/drivers/char/tpm/tpm-chip.c
> @@ -473,15 +473,8 @@ static void tpm_del_char_device(struct tpm_chip *chip)
> mutex_unlock(&idr_lock);
>
> /* Make the driver uncallable. */
> - down_write(&chip->ops_sem);
> - if (chip->flags & TPM_CHIP_FLAG_TPM2) {
> - if (!tpm_chip_start(chip)) {
> - tpm2_shutdown(chip, TPM2_SU_CLEAR);
> - tpm_chip_stop(chip);
> - }
> - }
> - chip->ops = NULL;
> - up_write(&chip->ops_sem);
> + if (chip->ops)
ops cannot be read without locking
Jason
