scsi_dh_rdac: always retry MODE SELECT on command lock violation

If MODE SELECT returns with sense '05/91/36' (command lock violation)
it should always be retried without counting the number of retries.
During an HBA upgrade or similar circumstances one might see a flood
of MODE SELECT command from various HBAs, which will easily trigger
the sense code and exceed the retry count.

Cc: <[e-mail]>
Signed-off-by: Hannes Reinecke <[e-mail]>
Reviewed-by: Johannes Thumshirn <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/device_handler/scsi_dh_rdac.c

···
 			/*
 			 * Command Lock contention
 			 */
-			err = SCSI_DH_RETRY;
+			err = SCSI_DH_IMM_RETRY;
 		break;
 	default:
 		break;
···
 	if (err != SCSI_DH_OK) {
 		err = mode_select_handle_sense(sdev, h->sense);
 		if (err == SCSI_DH_RETRY && retry_cnt--)
+			goto retry;
+		if (err == SCSI_DH_IMM_RETRY)
 			goto retry;
 	}
 	if (err == SCSI_DH_OK) {