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io_uring: use user visible tail in io_uring_poll()

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commit c10bb64684 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/228ffcbf30ba98856f66ffdb9a6a60ead1dd96c0.1674484266.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pavel Begunkov
2023-01-23 14:37:13 +00:00
committed by Greg Kroah-Hartman
parent f09fb7ff2a
commit c981a035df
1 changed files with 1 additions and 1 deletions
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2
io_uring/io_uring.c
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@@ -2653,7 +2653,7 @@ static __poll_t io_uring_poll(struct file *file, poll_table *wait)
* 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;