+static bool can_beacon_sec_chan(struct wiphy *wiphy,
+ struct ieee80211_channel *chan,
+ enum nl80211_channel_type channel_type)
+{
+ struct ieee80211_channel *sec_chan;
+ int diff;
+
+ switch (channel_type) {
+ case NL80211_CHAN_HT40PLUS:
+ diff = 20;
+ case NL80211_CHAN_HT40MINUS:
+ diff = -20;
+ default:
+ return false;
+ }
+
+ sec_chan = ieee80211_get_channel(wiphy, chan->center_freq + diff);
+ if (!sec_chan)
+ return false;
+
+ /* we'll need a DFS capability later */
+ if (sec_chan->flags & (IEEE80211_CHAN_DISABLED |
+ IEEE80211_CHAN_PASSIVE_SCAN |
+ IEEE80211_CHAN_NO_IBSS |
+ IEEE80211_CHAN_RADAR))
+ return false;
+
+ return true;
+}
+