[PATCH 5.12] io_uring: always go for cancellation spin on exec

[Pavel Begunkov <asml.silence@gmail.com>]

Always try to do cancellation in __io_uring_task_cancel() at least once,
so it actually goes and cleans its sqpoll tasks (i.e. via
io_sqpoll_cancel_sync()), otherwise sqpoll task may submit new requests
after cancellation and it's racy for many reasons.

Fixes: 521d6a737a31c ("io_uring: cancel sqpoll via task_work")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 fs/io_uring.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 66ae46874d85..0bbfb05572d6 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -9004,6 +9004,8 @@ void __io_uring_task_cancel(void)
 
 	/* make sure overflow events are dropped */
 	atomic_inc(&tctx->in_idle);
+	__io_uring_files_cancel(NULL);
+
 	do {
 		/* read completions before cancelations */
 		inflight = tctx_inflight(tctx);
-- 
2.24.0