This is a note to let you know that I've just added the patch titled
tpm_tis: Resend command to recover from data transfer errors
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tpm_tis-resend-command-to-recover-from-data-transfer.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 6d2110d42ae332a997e50ec0f81c91c1363bfadd
Author: Alexander Steffen <Alexander.Steffen@xxxxxxxxxxxx>
Date: Tue Jun 13 20:02:59 2023 +0200
tpm_tis: Resend command to recover from data transfer errors
[ 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@xxxxxxxxxxxx>
Reviewed-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
Signed-off-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index d7c440ac465f3..b3452259d6e0b 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -469,10 +469,17 @@ static int tpm_tis_send_main(struct tpm_chip *chip, const u8 *buf, size_t len)
int rc;
u32 ordinal;
unsigned long dur;
-
- rc = tpm_tis_send_data(chip, buf, len);
- if (rc < 0)
- return rc;
+ unsigned int try;
+
+ 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);
