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.
Change-Id: Ifad9cccff94b59242d36fba9c1e92c7a6bb57804
Signed-off-by: Alexander Steffen <Alexander.Steffen@xxxxxxxxxxxx>
---
drivers/char/tpm/tpm_tis_core.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index a08768e55803..47073cc79b51 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -535,10 +535,18 @@ 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);
--
2.34.1
