netdev - [PATCH net] amt: cancel delayed_work synchronously in amt

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Message-Id: <20211116160923.25258-1-ap420073@gmail.com>
Date:   Tue, 16 Nov 2021 16:09:23 +0000
From:   Taehee Yoo <ap420073@...il.com>
To:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org
Cc:     ap420073@...il.com
Subject: [PATCH net] amt: cancel delayed_work synchronously in amt_fini()

When the amt module is being removed, it calls cancel_delayed_work()
to cancel pending delayed_work. But this function doesn't wait for
canceling delayed_work.
So, workers can be still doing after module delete.

In order to avoid this, cancel_delayed_work_sync() should be used instead.

Suggested-by: Jakub Kicinski <kuba@...nel.org>
Fixes: bc54e49c140b ("amt: add multicast(IGMP) report message handler")
Signed-off-by: Taehee Yoo <ap420073@...il.com>
---
 drivers/net/amt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/amt.c b/drivers/net/amt.c
index 47a04c330885..b732ee9a50ef 100644
--- a/drivers/net/amt.c
+++ b/drivers/net/amt.c
@@ -3286,7 +3286,7 @@ static void __exit amt_fini(void)
 {
 	rtnl_link_unregister(&amt_link_ops);
 	unregister_netdevice_notifier(&amt_notifier_block);
-	cancel_delayed_work(&source_gc_wq);
+	cancel_delayed_work_sync(&source_gc_wq);
 	__amt_source_gc_work();
 	destroy_workqueue(amt_wq);
 }
-- 
2.17.1