mac80211: handle VHT operating mode notification

Handle the operating mode notification action frame.
When the supported streams or the bandwidth change
let the driver and rate control algorithm know.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/ht.c b/net/mac80211/ht.c
index a64b4f0..797969b 100644
--- a/net/mac80211/ht.c
+++ b/net/mac80211/ht.c
@@ -212,6 +212,10 @@
 		changed = true;
 	sta->sta.bandwidth = bw;
 
+	sta->cur_max_bandwidth =
+		ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
+				IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
+
 	return changed;
 }