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

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Message-Id: <20191016214907.445814511@linuxfoundation.org>
Date:   Wed, 16 Oct 2019 14:51:42 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Stefan Hajnoczi <stefanha@...hat.com>,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 5.3 110/112] io_uring: only flush workqueues on fileset removal

From: Jens Axboe <axboe@...nel.dk>

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@...r.kernel.org
Fixes: 6b06314c47e1 ("io_uring: add file set registration")
Reported-by: Stefan Hajnoczi <stefanha@...hat.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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);
 }