io_uring: patch up IOPOLL overflow_flush sync

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IOPOLL skips completion locking but keeps it under uring_lock, thus
io_cqring_overflow_flush() and so io_cqring_events() need additional
locking with uring_lock in some cases for IOPOLL.

Remove __io_cqring_overflow_flush() from io_cqring_events(), introduce a
wrapper around flush doing needed synchronisation and call it by hand.

Cc: stable@vger.kernel.org # 5.5+
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Pavel Begunkov 2021-01-04 20:36:36 +00:00 • committed by Jens Axboe

parent 81b6d05cca

commit 6c503150ae

1 changed files with 41 additions and 37 deletions

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fs/io_uring.c

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