[PATCH 01/11] io_uring: fix poll_remove stalled req completion

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

Taking the ctx lock is not enough to use the deferred request completion
infrastructure, it'll get queued into the list but no one would expect
it there, so it will sit there until next io_submit_flush_completions().
It's hard to care about the cancellation path, so complete it via tw.

Fixes: ef7dfac51d8ed ("io_uring/poll: serialize poll linked timer start with poll removal")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 io_uring/poll.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/io_uring/poll.c b/io_uring/poll.c
index 5f779139cae1..6db1dcb2c797 100644
--- a/io_uring/poll.c
+++ b/io_uring/poll.c
@@ -996,7 +996,6 @@ int io_poll_remove(struct io_kiocb *req, unsigned int issue_flags)
 	struct io_hash_bucket *bucket;
 	struct io_kiocb *preq;
 	int ret2, ret = 0;
-	struct io_tw_state ts = { .locked = true };
 
 	io_ring_submit_lock(ctx, issue_flags);
 	preq = io_poll_find(ctx, true, &cd, &ctx->cancel_table, &bucket);
@@ -1045,7 +1044,8 @@ int io_poll_remove(struct io_kiocb *req, unsigned int issue_flags)
 
 	req_set_fail(preq);
 	io_req_set_res(preq, -ECANCELED, 0);
-	io_req_task_complete(preq, &ts);
+	preq->io_task_work.func = io_req_task_complete;
+	io_req_task_work_add(preq);
 out:
 	io_ring_submit_unlock(ctx, issue_flags);
 	if (ret < 0) {
-- 
2.43.0