mac80211: fix monitor mode channel reporting

When not using channel contexts with only monitor mode interfaces being
active, report local->monitor_chandef to userspace.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/cfg.c

@@ -3285,15 +3285,21 @@ static int ieee80211_cfg_get_channel(struct wiphy *wiphy,
 				     struct cfg80211_chan_def *chandef)
 {
 	struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
+	struct ieee80211_local *local = wiphy_priv(wiphy);
 	struct ieee80211_chanctx_conf *chanctx_conf;
 	int ret = -ENODATA;
 
 	rcu_read_lock();
+	if (local->use_chanctx) {
 		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 		if (chanctx_conf) {
 			*chandef = chanctx_conf->def;
 			ret = 0;
 		}
+	} else if (local->open_count == local->monitors) {
+		*chandef = local->monitor_chandef;
+		ret = 0;
+	}
 	rcu_read_unlock();
 
 	return ret;