block: ensure we hold a queue reference when using queue limits

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[ Upstream commit 7b4f36cd22 ]

q_usage_counter is the only thing preventing us from the limits changing
under us in __bio_split_to_limits, but blk_mq_submit_bio doesn't hold
it while calling into it.

Move the splitting inside the region where we know we've got a queue
reference. Ideally this could still remain a shared section of code, but
let's keep the fix simple and defer any refactoring here to later.

Reported-by: Christoph Hellwig <hch@lst.de>
Fixes: 900e080752 ("block: move queue enter logic into blk_mq_submit_bio()")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Jens Axboe 2024-01-12 09:12:20 -07:00 • committed by Greg Kroah-Hartman

parent fdf3df297f

commit 33cf52b6e5

1 changed files with 10 additions and 6 deletions

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block/blk-mq.c

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