From: Pavel Begunkov asml.silence@gmail.com
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@vger.kernel.org Signed-off-by: Pavel Begunkov asml.silence@gmail.com Link: https://lore.kernel.org/r/228ffcbf30ba98856f66ffdb9a6a60ead1dd96c0.167448426... Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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;