--- linux-2.6.18.noarch/net/mac80211/cfg.c.orig	2009-12-07 10:22:28.000000000 -0500
+++ linux-2.6.18.noarch/net/mac80211/cfg.c	2009-12-07 10:22:46.000000000 -0500
@@ -74,7 +74,7 @@ static int ieee80211_change_iface(struct
 	struct ieee80211_sub_if_data *sdata;
 	int ret;
 
-	if (netif_running(sdata->dev))
+	if (netif_running(dev))
 		return -EBUSY;
 
 	if (!nl80211_type_check(type))