linux-kernel - Re: [PATCH] tpm_tis_core: Use common error handling code in tpm_tis_send

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Date:   Mon, 23 Oct 2017 15:42:02 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:     linux-integrity@...r.kernel.org,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        Peter Hüwe <PeterHuewe@....de>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] tpm_tis_core: Use common error handling code in
 tpm_tis_send_data()

On Sun, Oct 22, 2017 at 12:16:19PM +0200, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Sun, 22 Oct 2017 11:41:09 +0200
> 
> Add a jump target so that a specific error code assignment for timeout
> conditions will be in the implementation only at the end of this function.
> 
> This issue was detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  drivers/char/tpm/tpm_tis_core.c | 26 ++++++++++++--------------
>  1 file changed, 12 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
> index fdde971bc810..3681f7a74d1b 100644
> --- a/drivers/char/tpm/tpm_tis_core.c
> +++ b/drivers/char/tpm/tpm_tis_core.c
> @@ -262,12 +262,10 @@ static int tpm_tis_send_data(struct tpm_chip *chip, const u8 *buf, size_t len)
>  	status = tpm_tis_status(chip);
>  	if ((status & TPM_STS_COMMAND_READY) == 0) {
>  		tpm_tis_ready(chip);
> -		if (wait_for_tpm_stat
> -		    (chip, TPM_STS_COMMAND_READY, chip->timeout_b,
> -		     &priv->int_queue, false) < 0) {
> -			rc = -ETIME;
> -			goto out_err;
> -		}
> +		if (wait_for_tpm_stat(chip, TPM_STS_COMMAND_READY,
> +				      chip->timeout_b, &priv->int_queue, false)
> +		    < 0)
> +			goto report_timeout;
>  	}
>  
>  	while (count < len - 1) {
> @@ -286,10 +284,9 @@ static int tpm_tis_send_data(struct tpm_chip *chip, const u8 *buf, size_t len)
>  		count += burstcnt;
>  
>  		if (wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c,
> -					&priv->int_queue, false) < 0) {
> -			rc = -ETIME;
> -			goto out_err;
> -		}
> +				      &priv->int_queue, false) < 0)
> +			goto report_timeout;
> +
>  		status = tpm_tis_status(chip);
>  		if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) {
>  			rc = -EIO;
> @@ -303,10 +300,9 @@ static int tpm_tis_send_data(struct tpm_chip *chip, const u8 *buf, size_t len)
>  		goto out_err;
>  
>  	if (wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c,
> -				&priv->int_queue, false) < 0) {
> -		rc = -ETIME;
> -		goto out_err;
> -	}
> +			      &priv->int_queue, false) < 0)
> +		goto report_timeout;
> +
>  	status = tpm_tis_status(chip);
>  	if (!itpm && (status & TPM_STS_DATA_EXPECT) != 0) {
>  		rc = -EIO;
> @@ -315,6 +311,8 @@ static int tpm_tis_send_data(struct tpm_chip *chip, const u8 *buf, size_t len)
>  
>  	return 0;
>  
> +report_timeout:
> +	rc = -ETIME;
>  out_err:
>  	tpm_tis_ready(chip);
>  	return rc;
> -- 
> 2.14.2
> 

NAK. wait_for_tpm_stat() should give that error code.

/Jarkko