Re: [PATCH v8 11/11] tpm, tpm_tis: Enable interrupt test

From: Jarkko Sakkinen
Date: Sun Oct 23 2022 - 00:34:22 EST


On Tue, Oct 18, 2022 at 01:57:32AM +0200, Lino Sanfilippo wrote:
> From: Lino Sanfilippo <l.sanfilippo@xxxxxxxxxx>
>
> The test for interrupts in tpm_tis_send() is skipped if the flag
> TPM_CHIP_FLAG_IRQ is not set. Since the current code never sets the flag
> initially the test is never executed.
>
> Fix this by setting the flag in tpm_tis_gen_interrupt() right after
> interrupts have been enabled and before the test is executed.
>
> Signed-off-by: Lino Sanfilippo <l.sanfilippo@xxxxxxxxxx>
> Tested-by: Michael Niewöhner <linux@xxxxxxxxxxxxxx>
> ---
> drivers/char/tpm/tpm_tis_core.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
> index 42f628e52cde..9778860e1598 100644
> --- a/drivers/char/tpm/tpm_tis_core.c
> +++ b/drivers/char/tpm/tpm_tis_core.c
> @@ -793,11 +793,16 @@ static int tpm_tis_gen_interrupt(struct tpm_chip *chip)
> if (ret < 0)
> return ret;
>
> + chip->flags |= TPM_CHIP_FLAG_IRQ;
> +
> if (chip->flags & TPM_CHIP_FLAG_TPM2)
> ret = tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
> else
> ret = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc, 0);
>
> + if (ret)
> + chip->flags &= ~TPM_CHIP_FLAG_IRQ;
> +
> tpm_tis_release_locality(chip, 0);
>
> return ret;
> --
> 2.36.1
>


Reviewed-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>

BR, Jarkko