mac80211: require four hardware queues for QoS/HT

This patch makes mac80211 only announce QoS/HT support when
the underlying hardware has four (or more) queues.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Cc: Ron Rindjunksi <ron.rindjunksi@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index f35eaea9..3a03d78 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1490,8 +1490,8 @@
 		rcu_read_unlock();
 	}
 
-	/* receiver is QoS enabled, use a QoS type frame */
-	if (sta_flags & WLAN_STA_WME) {
+	/* receiver and we are QoS enabled, use a QoS type frame */
+	if (sta_flags & WLAN_STA_WME && local->hw.queues >= 4) {
 		fc |= IEEE80211_STYPE_QOS_DATA;
 		hdrlen += 2;
 	}