scsi: kill off the legacy IO path

This removes the legacy (non-mq) IO path for SCSI.

Cc: linux-scsi@vger.kernel.org
Acked-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Tested-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/scsi/scsi_error.c

@@ -308,7 +308,7 @@ enum blk_eh_timer_return scsi_times_out(struct request *req)
 		 * error handler. In that case we can return immediately as no
 		 * further action is required.
 		 */
-		if (req->q->mq_ops && !blk_mq_mark_complete(req))
+		if (!blk_mq_mark_complete(req))
 			return rtn;
 		if (scsi_abort_command(scmd) != SUCCESS) {
 			set_host_byte(scmd, DID_TIME_OUT);