mac80211: send channel switch started notifications

Send a channel switch notification to userspace when a channel switch
is requested or when we react to a remote CSA.
Signed-off-by: Luciano Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/cfg.c

@@ -3195,6 +3195,9 @@ __ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
 		ieee80211_stop_vif_queues(local, sdata,
 					  IEEE80211_QUEUE_STOP_REASON_CSA);
 
+	cfg80211_ch_switch_started_notify(sdata->dev, &sdata->csa_chandef,
+					  params->count);
+
 	if (changed) {
 		ieee80211_bss_info_change_notify(sdata, changed);
 		drv_channel_switch_beacon(sdata, &params->chandef);

net/mac80211/mlme.c

@@ -1205,6 +1205,9 @@ ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 					  IEEE80211_QUEUE_STOP_REASON_CSA);
 	mutex_unlock(&local->mtx);
 
+	cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
+					  csa_ie.count);
+
 	if (local->ops->channel_switch) {
 		/* use driver's channel switch callback */
 		drv_channel_switch(local, sdata, &ch_switch);