Commit aae2a643 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

block: exit elv_iosched_show early when I/O schedulers are not supported 



If the tag_set has BLK_MQ_F_NO_SCHED flag set we will never show any
scheduler, so exit early.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20221030100714.876891-4-hch@lst.de


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 81eaca44

block/elevator.c

+2 −3
Original line number Diff line number Diff line
@@ -783,7 +783,7 @@ ssize_t elv_iosched_show(struct request_queue *q, char *name) 
	struct elevator_type *__e;

	int len = 0;



	if (!queue_is_mq(q))

	if (!elv_support_iosched(q))

		return sprintf(name, "none\n");



	if (!q->elevator)
@@ -797,8 +797,7 @@ ssize_t elv_iosched_show(struct request_queue *q, char *name) 
			len += sprintf(name+len, "[%s] ", elv->elevator_name);

			continue;

		}

		if (elv_support_iosched(q) &&

		    elevator_match(__e, __e->elevator_name,

		if (elevator_match(__e, __e->elevator_name,

				   q->required_elevator_features))

			len += sprintf(name+len, "%s ", __e->elevator_name);

	}