--- zzzz-none-000/linux-3.10.107/drivers/isdn/act2000/module.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/isdn/act2000/module.c	2021-02-04 17:41:59.000000000 +0000
@@ -796,7 +796,7 @@
 	act2000_card *last;
 	while (card) {
 		unregister_card(card);
-		del_timer(&card->ptimer);
+		del_timer_sync(&card->ptimer);
 		card = card->next;
 	}
 	card = cards;