[PATCH 6.1 658/885] io_uring: use user visible tail in io_uring_poll()

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From: Pavel Begunkov <asml.silence@xxxxxxxxx>

commit c10bb64684813a326174c3eebcafb3ee5af52ca3 upstream.

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@xxxxxxxxxxxxxxx
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
Link: https://lore.kernel.org/r/228ffcbf30ba98856f66ffdb9a6a60ead1dd96c0.1674484266.git.asml.silence@xxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 io_uring/io_uring.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -2653,7 +2653,7 @@ static __poll_t io_uring_poll(struct fil
 	 * pushs 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;





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