[SCSI] megaraid_sas: Return DID_ERROR for SCSI IO, when controller is in critical h/w error

Do not return SCSI_MLQUEUE_HOST_BUSY, but send DID_ERROR to SCSI mid-layer, if
adapter is in critical error state.  "SCSI_MLQUEUE_HOST_BUSY" will keep same
SCSI command in loop and it is not a right return value, if controller is
hardware critical error.
Signed-off-by: Sumit Saxena <sumit.saxena@lsi.com>
Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

drivers/scsi/megaraid/megaraid_sas_base.c

@@ -1471,6 +1471,14 @@ megasas_queue_command_lck(struct scsi_cmnd *scmd, void (*done) (struct scsi_cmnd
 		return SCSI_MLQUEUE_HOST_BUSY;
 
 	spin_lock_irqsave(&instance->hba_lock, flags);
+
+	if (instance->adprecovery == MEGASAS_HW_CRITICAL_ERROR) {
+		spin_unlock_irqrestore(&instance->hba_lock, flags);
+		scmd->result = DID_ERROR << 16;
+		done(scmd);
+		return 0;
+	}
+
 	if (instance->adprecovery != MEGASAS_HBA_OPERATIONAL) {
 		spin_unlock_irqrestore(&instance->hba_lock, flags);
 		return SCSI_MLQUEUE_HOST_BUSY;