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>

7 files changed, 16 insertions, 30 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 47e0aca..be01953 100644
--- a/net/mac80211/cfg.c
+++ b/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;
 }
 
diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index 6b7644e..854de97 100644
--- a/net/mac80211/ibss.c
+++ b/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)) {
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 8be854e..ecf7d15 100644
--- a/net/mac80211/iface.c
+++ b/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);
 }
 
diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index 8565c00..8a9d5d0 100644
--- a/net/mac80211/mesh.c
+++ b/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);
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index a355292..6d61d2f 100644
--- a/net/mac80211/mlme.c
+++ b/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);
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index ca9fde1..d743645 100644
--- a/net/mac80211/sta_info.c
+++ b/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);
-	}
+	ieee80211_cleanup_sdata_stas(sdata);
+	cancel_work_sync(&sdata->cleanup_stations_wk);
 
 	return ret;
 }
diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h
index 37c1889..13698da 100644
--- a/net/mac80211/sta_info.h
+++ b/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);