diff mbox series

[v2,2/4] tpm_tis: Move CRC check to generic send routine

Message ID 20230605175959.2131-3-Alexander.Steffen@infineon.com
State New
Headers
Series Recovery from data transfer errors for tpm_tis |

Commit Message

Alexander Steffen June 5, 2023, 5:59 p.m. UTC 
  The CRC functionality is initialized before tpm_tis_core, so it can be used
on all code paths within the module. Therefore, move the CRC check to the
generic send routine, that also contains all other checks for successful
command transmission, so that all those checks are in one place.

Also, this ensures that tpm_tis_ready is called when a CRC failure is
detected, to clear the invalid data from the TPM, which did not happen
previously.

Signed-off-by: Alexander Steffen <Alexander.Steffen@infineon.com>
---
 drivers/char/tpm/tpm_tis_core.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

Comments

Jarkko Sakkinen June 6, 2023, 9:10 p.m. UTC | #1 
On Mon Jun 5, 2023 at 8:59 PM EEST, Alexander Steffen wrote:
> The CRC functionality is initialized before tpm_tis_core, so it can be used
> on all code paths within the module. Therefore, move the CRC check to the
> generic send routine, that also contains all other checks for successful
> command transmission, so that all those checks are in one place.
>
> Also, this ensures that tpm_tis_ready is called when a CRC failure is
> detected, to clear the invalid data from the TPM, which did not happen
> previously.
>
> Signed-off-by: Alexander Steffen <Alexander.Steffen@infineon.com>
> ---
>  drivers/char/tpm/tpm_tis_core.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
> index aaaa136044ae..5ddaf24518be 100644
> --- a/drivers/char/tpm/tpm_tis_core.c
> +++ b/drivers/char/tpm/tpm_tis_core.c
> @@ -466,6 +466,12 @@ static int tpm_tis_send_data(struct tpm_chip *chip, const u8 *buf, size_t len)
>  		goto out_err;
>  	}
>  
> +	rc = tpm_tis_verify_crc(priv, len, buf);
> +	if (rc < 0) {
> +		dev_err(&chip->dev, "CRC mismatch for command.\n");
> +		goto out_err;
> +	}
> +
>  	return 0;
>  
>  out_err:
> @@ -510,12 +516,6 @@ static int tpm_tis_send_main(struct tpm_chip *chip, const u8 *buf, size_t len)
>  	if (rc < 0)
>  		return rc;
>  
> -	rc = tpm_tis_verify_crc(priv, len, buf);
> -	if (rc < 0) {
> -		dev_err(&chip->dev, "CRC mismatch for command.\n");
> -		return rc;
> -	}
> -
>  	/* go and do it */
>  	rc = tpm_tis_write8(priv, TPM_STS(priv->locality), TPM_STS_GO);
>  	if (rc < 0)
> -- 
> 2.34.1

Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>

BR, Jarkko
diff mbox series

Patch

diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index aaaa136044ae..5ddaf24518be 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -466,6 +466,12 @@  static int tpm_tis_send_data(struct tpm_chip *chip, const u8 *buf, size_t len)
 		goto out_err;
 	}
 
+	rc = tpm_tis_verify_crc(priv, len, buf);
+	if (rc < 0) {
+		dev_err(&chip->dev, "CRC mismatch for command.\n");
+		goto out_err;
+	}
+
 	return 0;
 
 out_err:
@@ -510,12 +516,6 @@  static int tpm_tis_send_main(struct tpm_chip *chip, const u8 *buf, size_t len)
 	if (rc < 0)
 		return rc;
 
-	rc = tpm_tis_verify_crc(priv, len, buf);
-	if (rc < 0) {
-		dev_err(&chip->dev, "CRC mismatch for command.\n");
-		return rc;
-	}
-
 	/* go and do it */
 	rc = tpm_tis_write8(priv, TPM_STS(priv->locality), TPM_STS_GO);
 	if (rc < 0)