mac80211: reconfig bss_info_changed only if beaconing

For AP/IBSS/mesh interfaces, call the driver to reconfigure
bss_info_changed only if the interface was beaconing before
suspend, otherwise we call the driver and it might interpret
the change as going from enabled to disabled.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/util.c

@@ -1555,9 +1555,11 @@ int ieee80211_reconfig(struct ieee80211_local *local)
 
 			/* fall through */
 		case NL80211_IFTYPE_MESH_POINT:
+			if (sdata->vif.bss_conf.enable_beacon) {
 				changed |= BSS_CHANGED_BEACON |
 					   BSS_CHANGED_BEACON_ENABLED;
 				ieee80211_bss_info_change_notify(sdata, changed);
+			}
 			break;
 		case NL80211_IFTYPE_WDS:
 			break;