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@kernel.org>
Fixes: bc54e49c140b ("amt: add multicast(IGMP) report message handler")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Link: https://lore.kernel.org/r/20211116160923.25258-1-ap420073@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/amt.c b/drivers/net/amt.c
index 47a04c330885ef33a06e117b3f10e8393f4fa5ff..b732ee9a50ef948bd4fe30a32f9870ceb2ba0517 100644 (file)
--- 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);
 }