linux-kernel - Re: [PATCH] tpm: tpm_try_transmit() ignore value of go_to

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Date:   Thu, 18 Oct 2018 02:01:22 +0300 (EEST)
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Tomas Winkler <tomas.winkler@...el.com>
cc:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Nayna Jain <nayna@...ux.vnet.ibm.com>,
        Alexander Usyskin <alexander.usyskin@...el.com>,
        Tadeusz Struk <tadeusz.struk@...el.com>,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tpm: tpm_try_transmit() ignore value of go_to_idle()

On Mon, 15 Oct 2018, Tomas Winkler wrote:
> Ignore the return value of go_to_idle() in tpm_try_transmit().
> Once it may shadow the return value of actual tpm operation,
> second the consequent command will fail as well and the error
> will be caought anyway.
> Last fix wrong goto, that jumped back instead of forward.
>
> Fixes: 627448e85c76 ("tpm: separate cmd_ready/go_idle from runtime_pm")
> Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
> ---
> drivers/char/tpm/tpm-interface.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index 129f640424b7..f69c711bf74a 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -547,9 +547,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
> 		dev_err(&chip->dev, "tpm2_commit_space: error %d\n", rc);
>
> out:
> -	rc = tpm_go_idle(chip, flags);
> -	if (rc)
> -		goto out;
> +	(void)tpm_go_idle(chip, flags);
>
> 	if (need_locality)
> 		tpm_relinquish_locality(chip, flags);
> -- 
> 2.14.4
>
>

LGTM. Should be probably Cc'd to stable (can add).

Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

/Jarkko