[SCSI] Do not retry a request whose data integrity check failed

If initiator or target reject the I/O due to DIF errors there is no
point in retrying.
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/scsi_error.c

@@ -344,6 +344,9 @@ static int scsi_check_sense(struct scsi_cmnd *scmd)
 		return /* soft_error */ SUCCESS;
 
 	case ABORTED_COMMAND:
+		if (sshdr.asc == 0x10) /* DIF */
+			return SUCCESS;
+
 		return NEEDS_RETRY;
 	case NOT_READY:
 	case UNIT_ATTENTION:

drivers/scsi/scsi_lib.c

@@ -950,10 +950,15 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
 				 * 6-byte command.
 				 */
 				scsi_requeue_command(q, cmd);
-				return;
-			} else {
+			} else if (sshdr.asc == 0x10) /* DIX */
+				scsi_end_request(cmd, -EIO, this_count, 0);
+			else
 				scsi_end_request(cmd, -EIO, this_count, 1);
 			return;
+		case ABORTED_COMMAND:
+			if (sshdr.asc == 0x10) { /* DIF */
+				scsi_end_request(cmd, -EIO, this_count, 0);
+				return;
 			}
 			break;
 		case NOT_READY: