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blk-mq: don't issue request directly in case that current is to be blocked 

When flushing plug list in case that current will be blocked, we can't
issue request directly because ->queue_rq() may sleep, otherwise scheduler
may complain.

Fixes: dc5fc361d8 ("block: attempt direct issue of plug list")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20211026082257.2889890-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2021-10-26 16:22:57 +08:00 committed by Jens Axboe
parent 9f8b93a7df
commit ff1552232b
1 changed files with 1 additions and 1 deletions
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2
block/blk-mq.c
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@ -2223,7 +2223,7 @@ void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule)
return;
plug->rq_count = 0;
if (!plug->multiple_queues && !plug->has_elevator) {
if (!plug->multiple_queues && !plug->has_elevator && !from_schedule) {
blk_mq_plug_issue_direct(plug, from_schedule);
if (rq_list_empty(plug->mq_list))
return;