io_uring: Fix race for sqes with userspace
io_ring_submit() finalises with 1. io_commit_sqring(), which releases sqes to the userspace 2. Then calls to io_queue_link_head(), accessing released head's sqe Reorder them. Signed-off-by: NPavel Begunkov <asml.silence@gmail.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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