diff mbox series

[5.9,296/391] io_uring: use type appropriate io_kiocb handler for double poll

Message ID 20201103203407.049715487@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman Nov. 3, 2020, 8:35 p.m. UTC 
From: Jens Axboe <axboe@kernel.dk>

commit c8b5e2600a2cfa1cdfbecf151afd67aee227381d upstream.

io_poll_double_wake() is called for both request types - both pure poll
requests, and internal polls. This means that we should be using the
right handler based on the request type. Use the one that the original
caller already assigned for the waitqueue handling, that will always
match the correct type.

Cc: stable@vger.kernel.org # v5.8+
Reported-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/io_uring.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
diff mbox series

Patch

--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4786,8 +4786,10 @@  static int io_poll_double_wake(struct wa
 		/* make sure double remove sees this as being gone */
 		wait->private = NULL;
 		spin_unlock(&poll->head->lock);
-		if (!done)
-			__io_async_wake(req, poll, mask, io_poll_task_func);
+		if (!done) {
+			/* use wait func handler, so it matches the rq type */
+			poll->wait.func(&poll->wait, mode, sync, key);
+		}
 	}
 	refcount_dec(&req->refs);
 	return 1;