mac80211: remove final sta_info_flush()

When all interfaces have been removed, there can't
be any stations left over, so there's no need to
flush again. Remove this, and all code associated
with it, which also simplifies the function.
Tested-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/cfg.c

@@ -1010,8 +1010,8 @@ static int ieee80211_stop_ap(struct wiphy *wiphy, struct net_device *dev)
 		kfree_rcu(old_probe_resp, rcu_head);
 
 	list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
-		sta_info_flush(local, vlan);
-	sta_info_flush(local, sdata);
+		sta_info_flush(vlan);
+	sta_info_flush(sdata);
 	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 
 	drv_stop_ap(sdata->local, sdata);
@@ -1301,7 +1301,6 @@ static int ieee80211_add_station(struct wiphy *wiphy, struct net_device *dev,
 static int ieee80211_del_station(struct wiphy *wiphy, struct net_device *dev,
 				 u8 *mac)
 {
-	struct ieee80211_local *local = wiphy_priv(wiphy);
 	struct ieee80211_sub_if_data *sdata;
 
 	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
@@ -1309,7 +1308,7 @@ static int ieee80211_del_station(struct wiphy *wiphy, struct net_device *dev,
 	if (mac)
 		return sta_info_destroy_addr_bss(sdata, mac);
 
-	sta_info_flush(local, sdata);
+	sta_info_flush(sdata);
 	return 0;
 }
 

net/mac80211/ibss.c

@@ -67,7 +67,7 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 	skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
 
 	if (!ether_addr_equal(ifibss->bssid, bssid))
-		sta_info_flush(sdata->local, sdata);
+		sta_info_flush(sdata);
 
 	/* if merging, indicate to driver that we leave the old IBSS */
 	if (sdata->vif.bss_conf.ibss_joined) {
@@ -1182,7 +1182,7 @@ int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
 	memset(ifibss->bssid, 0, ETH_ALEN);
 	ifibss->ssid_len = 0;
 
-	sta_info_flush(sdata->local, sdata);
+	sta_info_flush(sdata);
 
 	spin_lock_bh(&ifibss->incomplete_lock);
 	while (!list_empty(&ifibss->incomplete_stations)) {

net/mac80211/iface.c

@@ -776,7 +776,7 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 	 * all other modes we've already removed all stations when
 	 * disconnecting etc.
 	 */
-	sta_info_flush(local, sdata);
+	sta_info_flush(sdata);
 
 	/*
 	 * Don't count this interface for promisc/allmulti while it
@@ -961,7 +961,6 @@ static void ieee80211_set_multicast_list(struct net_device *dev)
  */
 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 {
-	struct ieee80211_local *local = sdata->local;
 	int flushed;
 	int i;
 
@@ -977,7 +976,7 @@ static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 	if (ieee80211_vif_is_mesh(&sdata->vif))
 		mesh_rmc_free(sdata);
 
-	flushed = sta_info_flush(local, sdata);
+	flushed = sta_info_flush(sdata);
 	WARN_ON(flushed);
 }
 

net/mac80211/mesh.c

@@ -656,7 +656,7 @@ void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 
 	/* flush STAs and mpaths on this iface */
-	sta_info_flush(sdata->local, sdata);
+	sta_info_flush(sdata);
 	mesh_path_flush_by_iface(sdata);
 
 	del_timer_sync(&sdata->u.mesh.housekeeping_timer);

net/mac80211/mlme.c

@@ -1521,7 +1521,7 @@ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 	memset(ifmgd->bssid, 0, ETH_ALEN);
 
 	/* remove AP and TDLS peers */
-	sta_info_flush(local, sdata);
+	sta_info_flush(sdata);
 
 	/* finally reset all BSS / config parameters */
 	changed |= ieee80211_reset_erp_info(sdata);

net/mac80211/sta_info.c

@@ -885,7 +885,6 @@ void sta_info_init(struct ieee80211_local *local)
 void sta_info_stop(struct ieee80211_local *local)
 {
 	del_timer_sync(&local->sta_cleanup);
-	sta_info_flush(local, NULL);
 }
 
 /**
@@ -893,12 +892,11 @@ void sta_info_stop(struct ieee80211_local *local)
  *
  * Returns the number of removed STA entries.
  *
- * @local: local interface data
- * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
+ * @sdata: sdata to remove all stations from
  */
-int sta_info_flush(struct ieee80211_local *local,
-		   struct ieee80211_sub_if_data *sdata)
+int sta_info_flush(struct ieee80211_sub_if_data *sdata)
 {
+	struct ieee80211_local *local = sdata->local;
 	struct sta_info *sta, *tmp;
 	int ret = 0;
 
@@ -906,7 +904,7 @@ int sta_info_flush(struct ieee80211_local *local,
 
 	mutex_lock(&local->sta_mtx);
 	list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
-		if (!sdata || sdata == sta->sdata) {
+		if (sdata == sta->sdata) {
 			WARN_ON(__sta_info_destroy(sta));
 			ret++;
 		}
@@ -915,17 +913,8 @@ int sta_info_flush(struct ieee80211_local *local,
 
 	rcu_barrier();
 
-	if (sdata) {
-		ieee80211_cleanup_sdata_stas(sdata);
-		cancel_work_sync(&sdata->cleanup_stations_wk);
-	} else {
-		mutex_lock(&local->iflist_mtx);
-		list_for_each_entry(sdata, &local->interfaces, list) {
 	ieee80211_cleanup_sdata_stas(sdata);
 	cancel_work_sync(&sdata->cleanup_stations_wk);
-		}
-		mutex_unlock(&local->iflist_mtx);
-	}
 
 	return ret;
 }

net/mac80211/sta_info.h

@@ -548,8 +548,7 @@ void sta_info_recalc_tim(struct sta_info *sta);
 
 void sta_info_init(struct ieee80211_local *local);
 void sta_info_stop(struct ieee80211_local *local);
-int sta_info_flush(struct ieee80211_local *local,
-		   struct ieee80211_sub_if_data *sdata);
+int sta_info_flush(struct ieee80211_sub_if_data *sdata);
 void sta_set_rate_info_tx(struct sta_info *sta,
 			  const struct ieee80211_tx_rate *rate,
 			  struct rate_info *rinfo);