The current behavior for SCSI commands submitted while error recovery is
ongoing is to retry command submission after error recovery has finished.
See also the scsi_host_in_recovery() check in scsi_host_queue_ready(). Add
support for failing SCSI commands while host recovery is in progress. This
functionality will be used to fix a deadlock in the UFS driver.
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Mike Christie <michael.christie@oracle.com>
Cc: Hannes Reinecke <hare@suse.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20221018202958.1902564-4-bvanassche@acm.org
Reviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
struct scsi_device *sdev,
struct scsi_cmnd *cmd)
{
- if (scsi_host_in_recovery(shost))
- return 0;
-
if (atomic_read(&shost->host_blocked) > 0) {
if (scsi_host_busy(shost) > 0)
goto starved;
ret = BLK_STS_RESOURCE;
if (!scsi_target_queue_ready(shost, sdev))
goto out_put_budget;
+ if (unlikely(scsi_host_in_recovery(shost))) {
+ if (cmd->flags & SCMD_FAIL_IF_RECOVERING)
+ ret = BLK_STS_OFFLINE;
+ goto out_dec_target_busy;
+ }
if (!scsi_host_queue_ready(q, shost, sdev, cmd))
goto out_dec_target_busy;
#define SCMD_TAGGED (1 << 0)
#define SCMD_INITIALIZED (1 << 1)
#define SCMD_LAST (1 << 2)
+#define SCMD_FAIL_IF_RECOVERING (1 << 4)
/* flags preserved across unprep / reprep */
-#define SCMD_PRESERVED_FLAGS (SCMD_INITIALIZED)
+#define SCMD_PRESERVED_FLAGS (SCMD_INITIALIZED | SCMD_FAIL_IF_RECOVERING)
/* for scmd->state */
#define SCMD_STATE_COMPLETE 0