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(-)
--- 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;