diff options
| author | Alexander Steffen <Alexander.Steffen@infineon.com> | 2023-06-13 21:02:59 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-09-23 12:11:02 +0300 |
| commit | b62e8838e988c9a83b1456cc43abc0368884ffd5 (patch) | |
| tree | aca4cbf51d853690b02ff653fe3cb3b6556589d9 /drivers/char | |
| parent | c2b226f223fb4c4e06273592e41d2a8d15f814d9 (diff) | |
| download | linux-b62e8838e988c9a83b1456cc43abc0368884ffd5.tar.xz | |
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@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>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/tpm/tpm_tis_core.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c index 44f71f2c8cfa..5889d9edaf94 100644 --- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -498,10 +498,17 @@ 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; - 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; + } rc = tpm_tis_verify_crc(priv, len, buf); if (rc < 0) { |