[PATCH 5.3 110/112] io_uring: only flush workqueues on fileset removal

[Greg Kroah-Hartman]

From: Jens Axboe <axboe@xxxxxxxxx>

commit 8a99734081775c012a4a6c442fdef0379fe52bdf upstream.

We should not remove the workqueue, we just need to ensure that the
workqueues are synced. The workqueues are torn down on ctx removal.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 6b06314c47e1 ("io_uring: add file set registration")
Reported-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 fs/io_uring.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2566,7 +2566,8 @@ static void io_destruct_skb(struct sk_bu
 {
 	struct io_ring_ctx *ctx = skb->sk->sk_user_data;
 
-	io_finish_async(ctx);
+	if (ctx->sqo_wq)
+		flush_workqueue(ctx->sqo_wq);
 	unix_destruct_scm(skb);
 }