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tpm_tis: Resend command to recover from data transfer errors

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[ Upstream commit 280db21e153d8810ce3b93640c63ae922bcb9e8e ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alexander Steffen
2023-06-13 20:02:59 +02:00
committed by Greg Kroah-Hartman
parent 0fc7147c69
commit c7a8813d91
1 changed files with 10 additions and 3 deletions
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9
drivers/char/tpm/tpm_tis_core.c
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@@ -469,10 +469,17 @@ static int tpm_tis_send_main(struct tpm_chip *chip, const u8 *buf, size_t len)
int rc; int rc;
u32 ordinal; u32 ordinal;
unsigned long dur; unsigned long dur;
unsigned int try;
for (try = 0; try < TPM_RETRY; try++) {
rc = tpm_tis_send_data(chip, buf, len); rc = tpm_tis_send_data(chip, buf, len);
if (rc < 0) if (rc >= 0)
/* Data transfer done successfully */
break;
else if (rc != -EIO)
/* Data transfer failed, not recoverable */
return rc; return rc;
}
/* go and do it */ /* go and do it */
rc = tpm_tis_write8(priv, TPM_STS(priv->locality), TPM_STS_GO); rc = tpm_tis_write8(priv, TPM_STS(priv->locality), TPM_STS_GO);