diff --git a/net/irda/irttp.c b/net/irda/irttp.c
index a7486b3bddcb0150f7afadcab71ad40d85d6dec6..da3f2bc1b6f62abceb470f2f6407c3a7f680e307 100644
--- a/net/irda/irttp.c
+++ b/net/irda/irttp.c
@@ -1455,6 +1455,7 @@ struct tsap_cb *irttp_dup(struct tsap_cb *orig, void *instance)
 
 	/* Not everything should be copied */
 	new->notify.instance = instance;
+	spin_lock_init(&new->lock);
 	init_timer(&new->todo_timer);
 
 	skb_queue_head_init(&new->rx_queue);