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blk-mq: don't use plug->mq_list->q directly in blk_mq_run_dispatch_ops() 

blk_mq_run_dispatch_ops() is defined as one macro, and plug->mq_list
will be changed when running 'dispatch_ops', so add one local variable
for holding request queue.

Reported-and-tested-by: Yi Zhang <yi.zhang@redhat.com>
Fixes: 4cafe86c92 ("blk-mq: run dispatch lock once in case of issuing from list")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2021-12-06 11:33:50 +08:00 committed by Jens Axboe
parent 41adf531e3
commit 73f3760edd
1 changed files with 3 additions and 1 deletions
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4
block/blk-mq.c
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@ -2521,7 +2521,9 @@ void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule)
plug->rq_count = 0;
if (!plug->multiple_queues && !plug->has_elevator && !from_schedule) {
blk_mq_run_dispatch_ops(plug->mq_list->q,
struct request_queue *q = rq_list_peek(&plug->mq_list)->q;
blk_mq_run_dispatch_ops(q,
blk_mq_plug_issue_direct(plug, false));
if (rq_list_empty(plug->mq_list))
return;