ieee80211_vif_get_num_mcast_if 2496 net/mac80211/rx.c 		    ieee80211_vif_get_num_mcast_if(sdata) != 0) {
ieee80211_vif_get_num_mcast_if  338 net/mac80211/tx.c 			    ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {