block: remove the always unused name argument to elevator_init

Reported-by: Damien Le Moal <Damien.LeMoal@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Tested-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: Christoph Hellwig

block/blk-core.c

@@ -1179,7 +1179,7 @@ int blk_init_allocated_queue(struct request_queue *q)
 	mutex_lock(&q->sysfs_lock);
 
 	/* init elevator */
-	if (elevator_init(q, NULL)) {
+	if (elevator_init(q)) {
 		mutex_unlock(&q->sysfs_lock);
 		goto out_exit_flush_rq;
 	}

block/blk-mq-sched.c

@@ -653,7 +653,7 @@ int blk_mq_sched_init(struct request_queue *q)
 	int ret;
 
 	mutex_lock(&q->sysfs_lock);
-	ret = elevator_init(q, NULL);
+	ret = elevator_init(q);
 	mutex_unlock(&q->sysfs_lock);
 
 	return ret;

block/blk.h

@@ -231,7 +231,7 @@ static inline void elv_deactivate_rq(struct request_queue *q, struct request *rq
 		e->type->ops.sq.elevator_deactivate_req_fn(q, rq);
 }
 
-int elevator_init(struct request_queue *, char *);
+int elevator_init(struct request_queue *);
 void elevator_exit(struct request_queue *, struct elevator_queue *);
 int elv_register_queue(struct request_queue *q);
 void elv_unregister_queue(struct request_queue *q);

block/elevator.c

@@ -199,7 +199,7 @@ static void elevator_release(struct kobject *kobj)
 	kfree(e);
 }
 
-int elevator_init(struct request_queue *q, char *name)
+int elevator_init(struct request_queue *q)
 {
 	struct elevator_type *e = NULL;
 	int err;
@@ -213,19 +213,13 @@ int elevator_init(struct request_queue *q, char *name)
 	if (unlikely(q->elevator))
 		return 0;
 
-	if (name) {
-		e = elevator_get(q, name, true);
-		if (!e)
-			return -EINVAL;
-	}
-
 	/*
 	 * Use the default elevator specified by config boot param for
 	 * non-mq devices, or by config option. Don't try to load modules
 	 * as we could be running off async and request_module() isn't
 	 * allowed from async.
 	 */
-	if (!e && !q->mq_ops && *chosen_elevator) {
+	if (!q->mq_ops && *chosen_elevator) {
 		e = elevator_get(q, chosen_elevator, false);
 		if (!e)
 			printk(KERN_ERR "I/O scheduler %s not found\n",