io_uring: halt SQO submission on ctx exit

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io_sq_thread_finish() is called in io_ring_ctx_free(), so SQPOLL task is
potentially running submitting new requests. It's not a disaster because
of using a "try" variant of percpu_ref_get, but is far from nice.

Remove ctx from the sqd ctx list earlier, before cancellation loop, so
SQPOLL can't find it and so won't submit new requests.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Pavel Begunkov 2021-03-14 20:57:11 +00:00 • committed by Jens Axboe

parent 09a6f4efaa

commit f6d54255f4

1 changed files with 8 additions and 0 deletions

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fs/io_uring.c

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