Commit 280db21e authored by Alexander Steffen's avatar Alexander Steffen Committed by Jarkko Sakkinen
Browse files

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: default avatarAlexander Steffen <Alexander.Steffen@infineon.com>
Reviewed-by: default avatarJarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: default avatarJarkko Sakkinen <jarkko@kernel.org>
parent b400f9d3

drivers/char/tpm/tpm_tis_core.c

+10 −3
Original line number Diff line number Diff line
@@ -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;



	for (try = 0; try < TPM_RETRY; try++) {

		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;

	}



	/* go and do it */

	rc = tpm_tis_write8(priv, TPM_STS(priv->locality), TPM_STS_GO);