io_uring: fix ctx refcounting in io_submit_sqes()
If io_get_req() fails, it drops a ref. Then, awhile keeping @submitted unmodified, io_submit_sqes() breaks the loop and puts @nr - @submitted refs. For each submitted req a ref is dropped in io_put_req() and friends. So, for @nr taken refs there will be (@nr - @submitted + @submitted + 1) dropped. Remove ctx refcounting from io_get_req(), that at the same time makes it clearer. Fixes: 2b85edfc ("io_uring: batch getting pcpu references") Cc: stable@vger.kernel.org # v5.6 Signed-off-by:Pavel Begunkov <asml.silence@gmail.com> Signed-off-by:
Jens Axboe <axboe@kernel.dk>
parent
581f9810
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