mac80211: optimise synchronize_net() for sta_info_flush

There's no reason to have one synchronize_net() for each
removed station, refactor the code slightly to have just
a single synchronize_net() for all stations.

Note that this is currently useless as hostapd removes
stations one by one and this coalescing never happens.

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

2 files changed, 41 insertions, 4 deletions

diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 08e50760e092..89d449d0de6d 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -794,7 +794,7 @@ static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
         return have_buffered;
 }
 
-int __must_check __sta_info_destroy(struct sta_info *sta)
+static int __must_check __sta_info_destroy_part1(struct sta_info *sta)
 {
         struct ieee80211_local *local;
         struct ieee80211_sub_if_data *sdata;
@@ -831,7 +831,23 @@ int __must_check __sta_info_destroy(struct sta_info *sta)
             rcu_access_pointer(sdata->u.vlan.sta) == sta)
                 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
 
-        synchronize_net();
+        return 0;
+}
+
+static void __sta_info_destroy_part2(struct sta_info *sta)
+{
+        struct ieee80211_local *local = sta->local;
+        struct ieee80211_sub_if_data *sdata = sta->sdata;
+        int ret;
+
+        /*
+         * NOTE: This assumes at least synchronize_net() was done
+         *       after _part1 and before _part2!
+         */
+
+        might_sleep();
+        lockdep_assert_held(&local->sta_mtx);
+
         /* now keys can no longer be reached */
         ieee80211_free_sta_keys(local, sta);
 
@@ -863,6 +879,18 @@ int __must_check __sta_info_destroy(struct sta_info *sta)
         ieee80211_recalc_min_chandef(sdata);
 
         cleanup_single_sta(sta);
+}
+
+int __must_check __sta_info_destroy(struct sta_info *sta)
+{
+        int err = __sta_info_destroy_part1(sta);
+
+        if (err)
+                return err;
+
+        synchronize_net();
+
+        __sta_info_destroy_part2(sta);
 
         return 0;
 }
@@ -936,6 +964,7 @@ int sta_info_flush(struct ieee80211_sub_if_data *sdata)
 {
         struct ieee80211_local *local = sdata->local;
         struct sta_info *sta, *tmp;
+        LIST_HEAD(free_list);
         int ret = 0;
 
         might_sleep();
@@ -943,10 +972,17 @@ int sta_info_flush(struct ieee80211_sub_if_data *sdata)
         mutex_lock(&local->sta_mtx);
         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
                 if (sdata == sta->sdata) {
-                        WARN_ON(__sta_info_destroy(sta));
+                        if (!WARN_ON(__sta_info_destroy_part1(sta)))
+                                list_add(&sta->free_list, &free_list);
                         ret++;
                 }
         }
+
+        if (!list_empty(&free_list)) {
+                synchronize_net();
+                list_for_each_entry_safe(sta, tmp, &free_list, free_list)
+                        __sta_info_destroy_part2(sta);
+        }
         mutex_unlock(&local->sta_mtx);
 
         return ret;
diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h
index 9104f812e9de..f6081e574a28 100644
--- a/net/mac80211/sta_info.h
+++ b/net/mac80211/sta_info.h
@@ -247,6 +247,7 @@ struct ieee80211_tx_latency_stat {
  * mac80211 is communicating with.
  *
  * @list: global linked list entry
+ * @free_list: list entry for keeping track of stations to free
  * @hnext: hash table linked list pointer
  * @local: pointer to the global information
  * @sdata: virtual interface this station belongs to
@@ -329,7 +330,7 @@ struct ieee80211_tx_latency_stat {
  */
 struct sta_info {
         /* General information, mostly static */
-        struct list_head list;
+        struct list_head list, free_list;
         struct rcu_head rcu_head;
         struct sta_info __rcu *hnext;
         struct ieee80211_local *local;