linux-kernel - Re: [PATCH v5 10/10] tpm, tpm

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Date:   Wed, 15 Jun 2022 21:26:35 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     LinoSanfilippo@....de, James.Bottomley@...senpartnership.com
Cc:     peterhuewe@....de, jgg@...pe.ca, stefanb@...ux.vnet.ibm.com,
        linux@...ewoehner.de, linux-integrity@...r.kernel.org,
        linux-kernel@...r.kernel.org, l.sanfilippo@...bus.com,
        lukas@...ner.de, p.rosenberger@...bus.com
Subject: Re: [PATCH v5 10/10] tpm, tpm_tis: Enable interrupt test

On Fri, Jun 10, 2022 at 01:08:46PM +0200, LinoSanfilippo@....de wrote:
> From: Lino Sanfilippo <l.sanfilippo@...bus.com>
> 
> 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.
> 
> Signed-off-by: Lino Sanfilippo <l.sanfilippo@...bus.com>
> ---
>  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 e5edf745fb23..be229c173f10 100644
> --- a/drivers/char/tpm/tpm_tis_core.c
> +++ b/drivers/char/tpm/tpm_tis_core.c
> @@ -774,11 +774,16 @@ 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;
> +
>  	release_locality(chip, 0);
>  
>  	return ret;
> -- 
> 2.36.1
> 

James, do you have a chance to test this on your side? Thanks.

BR, Jarkko