blk-mq: don't insert passthrough request into sw queue

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[ Upstream commit 2293cae703 ]

In case of real io scheduler, q->elevator is set, so blk_mq_run_hw_queue()
may just check if scheduler queue has request to dispatch, see
__blk_mq_sched_dispatch_requests(). Then IO hang may be caused because
all passthorugh requests may stay in sw queue.

And any passthrough request should have been inserted to hctx->dispatch
always.

Reported-by: Guangwu Zhang <guazhang@redhat.com>
Fixes: d97217e7f0 ("blk-mq: don't queue plugged passthrough requests into scheduler")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20230621132208.1142318-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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This commit is contained in:

Ming Lei 2023-06-21 21:22:08 +08:00 • committed by Greg Kroah-Hartman

parent ad87179a20

commit eb287ef384

1 changed files with 6 additions and 1 deletions

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block/blk-mq.c

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