Add a comment block describing the COMPLETED case with asc/ascq 0x55/0xa
to mention that it relates to command duration limits very special
policy 0xD command completion.
Signed-off-by: Damien Le Moal <dlemoal@xxxxxxxxxx>
---
drivers/scsi/scsi_error.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 815e7d63f3e2..d08ed65abfa6 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -711,6 +711,13 @@ enum scsi_disposition scsi_check_sense(struct scsi_cmnd *scmd)
return SUCCESS;
case COMPLETED:
+ /*
+ * A command using command duration limits (CDL) with a
+ * descriptor set with policy 0xD may be completed with success
+ * and the sense data DATA CURRENTLY UNAVAILABLE, indicating
+ * that the command was in fact aborted because it exceeded its
+ * duration limit. Never retry these commands.
+ */
if (sshdr.asc == 0x55 && sshdr.ascq == 0x0a) {
set_scsi_ml_byte(scmd, SCSIML_STAT_DL_TIMEOUT);
req->cmd_flags |= REQ_FAILFAST_DEV;
--
2.48.1
