io_uring: fix ->flags races by linked timeouts
[ Upstream commit efe814a4 ] It's racy to modify req->flags from a not owning context, e.g. linked timeout calling req_set_fail_links() for the master request might race with that request setting/clearing flags while being executed concurrently. Just remove req_set_fail_links(prev) from io_link_timeout_fn(), io_async_find_and_cancel() and functions down the line take care of setting the fail bit. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <sashal@kernel.org>
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