block: remove the e argument to elevator_exit

All callers pass q->elevator.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20211123185312.1432157-4-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/blk-sysfs.c

@@ -747,7 +747,7 @@ static void blk_exit_queue(struct request_queue *q)
 	 */
 	if (q->elevator) {
 		ioc_clear_queue(q);
-		elevator_exit(q, q->elevator);
+		elevator_exit(q);
 	}
 
 	/*

block/blk.h

@@ -266,7 +266,7 @@ void blk_insert_flush(struct request *rq);
 
 int elevator_switch_mq(struct request_queue *q,
 			      struct elevator_type *new_e);
-void elevator_exit(struct request_queue *, struct elevator_queue *);
+void elevator_exit(struct request_queue *q);
 int elv_register_queue(struct request_queue *q, bool uevent);
 void elv_unregister_queue(struct request_queue *q);
 

block/elevator.c

@@ -188,8 +188,10 @@ static void elevator_release(struct kobject *kobj)
 	kfree(e);
 }
 
-void elevator_exit(struct request_queue *q, struct elevator_queue *e)
+void elevator_exit(struct request_queue *q)
 {
+	struct elevator_queue *e = q->elevator;
+
 	mutex_lock(&e->sysfs_lock);
 	blk_mq_exit_sched(q, e);
 	mutex_unlock(&e->sysfs_lock);
@@ -596,7 +598,7 @@ int elevator_switch_mq(struct request_queue *q,
 
 		ioc_clear_queue(q);
 		blk_mq_sched_free_rqs(q);
-		elevator_exit(q, q->elevator);
+		elevator_exit(q);
 	}
 
 	ret = blk_mq_init_sched(q, new_e);
@@ -607,7 +609,7 @@ int elevator_switch_mq(struct request_queue *q,
 		ret = elv_register_queue(q, true);
 		if (ret) {
 			blk_mq_sched_free_rqs(q);
-			elevator_exit(q, q->elevator);
+			elevator_exit(q);
 			goto out;
 		}
 	}