From: Johannes Berg Date: Fri, 20 Mar 2015 16:24:22 +0100 Subject: [PATCH] mac80211: drop 4-addr VLAN frames earlier if not connected If there's no station on the 4-addr VLAN interface, then frames cannot be transmitted. Drop such frames earlier, before setting up all the information for them. We should keep the old check though since that code might be used for other internally-generated frames. Signed-off-by: Johannes Berg --- --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -1921,6 +1921,9 @@ static struct sk_buff *ieee80211_build_h authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); wme_sta = sta->sta.wme; have_station = true; + } else if (sdata->wdev.use_4addr) { + ret = -ENOLINK; + goto free; } ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);