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tpm_tis: Resend command to recover from data transfer errors 

Similar to the transmission of TPM responses, also the transmission of TPM
commands may become corrupted. Instead of aborting when detecting such
issues, try resending the command again.

Signed-off-by: Alexander Steffen <Alexander.Steffen@infineon.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
This commit is contained in:
Alexander Steffen 2023-06-13 20:02:59 +02:00 committed by Jarkko Sakkinen
parent b400f9d33f
commit 280db21e15
1 changed files with 10 additions and 3 deletions
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13
drivers/char/tpm/tpm_tis_core.c
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@ -539,10 +539,17 @@ static int tpm_tis_send_main(struct tpm_chip *chip, const u8 *buf, size_t len)
int rc;
u32 ordinal;
unsigned long dur;
unsigned int try;
rc = tpm_tis_send_data(chip, buf, len);
if (rc < 0)
return rc;
for (try = 0; try < TPM_RETRY; try++) {
rc = tpm_tis_send_data(chip, buf, len);
if (rc >= 0)
/* Data transfer done successfully */
break;
else if (rc != -EIO)
/* Data transfer failed, not recoverable */
return rc;
}
/* go and do it */
rc = tpm_tis_write8(priv, TPM_STS(priv->locality), TPM_STS_GO);