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io_uring/rw: don't lose short results on io_setup_async_rw()
commit c278d9f upstream. If a retry io_setup_async_rw() fails we lose result from the first io_iter_do_read(), which is a problem mostly for streams/sockets. Cc: stable@vger.kernel.org Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/0e8d20cebe5fc9c96ed268463c394237daabc384.1664235732.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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