Data transfer to/from hardware TPM devices is not always fully reliable. The existing driver code contains already many checks to detect corrupted data (e.g. unexpected register values, CRC failures, etc.) and usually returns EIO in such cases. This series adds automatic retries to the command/response transmission in tpm_tis_send/tpm_tis_recv, so that occasional communication errors do not cause the command execution to fail and the perceived reliability of the TPM device is increased. v3: * Rename tpm_tis_recv* functions * Other small cleanups that were suggested in comments v2: * Remove Change-Ids accidentially left in commit messages Alexander Steffen (4): tpm_tis: Explicitly check for error code tpm_tis: Move CRC check to generic send routine tpm_tis: Use responseRetry to recover from data transfer errors tpm_tis: Resend command to recover from data transfer errors drivers/char/tpm/tpm_tis_core.c | 69 ++++++++++++++++++++++++--------- drivers/char/tpm/tpm_tis_core.h | 1 + 2 files changed, 52 insertions(+), 18 deletions(-) -- 2.25.1
