[PATCH 1/3] io_uring: disable multishot poll for double poll add cases

[Jens Axboe <axboe@kernel.dk>]

The re-add handling isn't correct for the multi wait case, so let's
just disable it for now explicitly until we can get that sorted out.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 fs/io_uring.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index ab14692b05b4..87ce3dbcd4ca 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4976,6 +4976,11 @@ static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt,
 			pt->error = -EINVAL;
 			return;
 		}
+		/* don't allow double poll use cases with multishot */
+		if (!(req->poll.events & EPOLLONESHOT)) {
+			pt->error = -EINVAL;
+			return;
+		}
 		/* double add on the same waitqueue head, ignore */
 		if (poll->head == head)
 			return;
-- 
2.31.1