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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: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20221030100714.876891-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2022-10-30 11:07:10 +01:00 committed by Jens Axboe
parent 81eaca442e
commit aae2a643f5
1 changed files with 2 additions and 3 deletions
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5
block/elevator.c
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@ -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);
}