mac80211: use oper_channel in mesh

Using hw.conf.channel is wrong as it could be the
temporary channel if any function like the beacon
get function is called while scanning or during
other temporary out-of-channel activities.

Use oper_channel instead.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/mesh.c

@@ -349,17 +349,18 @@ int mesh_add_ds_params_ie(struct sk_buff *skb,
 {
 	struct ieee80211_local *local = sdata->local;
 	struct ieee80211_supported_band *sband;
+	struct ieee80211_channel *chan = local->oper_channel;
 	u8 *pos;
 
 	if (skb_tailroom(skb) < 3)
 		return -ENOMEM;
 
-	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
+	sband = local->hw.wiphy->bands[chan->band];
 	if (sband->band == IEEE80211_BAND_2GHZ) {
 		pos = skb_put(skb, 2 + 1);
 		*pos++ = WLAN_EID_DS_PARAMS;
 		*pos++ = 1;
-		*pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq);
+		*pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 	}
 
 	return 0;
@@ -603,7 +604,7 @@ void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 	sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
 	sdata->vif.bss_conf.basic_rates =
 		ieee80211_mandatory_rates(sdata->local,
-					  sdata->local->hw.conf.channel->band);
+					  sdata->local->oper_channel->band);
 	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
 						BSS_CHANGED_BEACON_ENABLED |
 						BSS_CHANGED_HT |