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scsi: scsi_error: Add comments to scsi_check_sense()

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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@kernel.org>
Link: https://lore.kernel.org/r/20250228031751.12083-1-dlemoal@kernel.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Damien Le Moal 2025-02-28 12:17:51 +09:00 committed by Martin K. Petersen
parent 0711f1966a
commit e6a815673b
1 changed files with 7 additions and 0 deletions
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7
drivers/scsi/scsi_error.c
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@ -723,6 +723,13 @@ 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;