Commit c10bb646 authored by Pavel Begunkov's avatar Pavel Begunkov Committed by Jens Axboe
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io_uring: use user visible tail in io_uring_poll() 



We return POLLIN from io_uring_poll() depending on whether there are
CQEs for the userspace, and so we should use the user visible tail
pointer instead of a transient cached value.

Cc: stable@vger.kernel.org
Signed-off-by: default avatarPavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/228ffcbf30ba98856f66ffdb9a6a60ead1dd96c0.1674484266.git.asml.silence@gmail.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent f4992544

io_uring/io_uring.c

+1 −1
Original line number Diff line number Diff line
@@ -2886,7 +2886,7 @@ static __poll_t io_uring_poll(struct file *file, poll_table *wait) 
	 * pushes them to do the flush.

	 */



	if (io_cqring_events(ctx) || io_has_work(ctx))

	if (__io_cqring_events_user(ctx) || io_has_work(ctx))

		mask |= EPOLLIN | EPOLLRDNORM;



	return mask;