4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Alexander Steffen <Alexander.Steffen@xxxxxxxxxxxx>
[ 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>
---
drivers/char/tpm/tpm_tis_core.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index 430a9eac67e19..d1869b9a2ffd3 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -425,10 +425,17 @@ 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);
--
2.40.1
