mac80211: cache mesh beacon

Previously, the entire mesh beacon would be generated each
time the beacon timer fired. Instead generate a beacon
head and tail (so the TIM can easily be inserted when mesh
power save is on) when starting a mesh or the MBSS
parameters change.

Also add a mutex for protecting beacon updates and
preventing leaks.

Signed-off-by: Thomas Pedersen <thomas@cozybit.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 3 insertions, 6 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index c3869ba42343..0800fb331ce5 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1800,11 +1800,10 @@ static int ieee80211_update_mesh_config(struct wiphy *wiphy,
                 conf->power_mode = nconf->power_mode;
                 ieee80211_mps_local_status_update(sdata);
         }
-        if (_chg_mesh_attr(NL80211_MESHCONF_AWAKE_WINDOW, mask)) {
+        if (_chg_mesh_attr(NL80211_MESHCONF_AWAKE_WINDOW, mask))
                 conf->dot11MeshAwakeWindowDuration =
                         nconf->dot11MeshAwakeWindowDuration;
-                ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
-        }
+        ieee80211_mbss_info_change_notify(sdata, BSS_CHANGED_BEACON);
         return 0;
 }
 
@@ -1830,9 +1829,7 @@ static int ieee80211_join_mesh(struct wiphy *wiphy, struct net_device *dev,
         if (err)
                 return err;
 
-        ieee80211_start_mesh(sdata);
-
-        return 0;
+        return ieee80211_start_mesh(sdata);
 }
 
 static int ieee80211_leave_mesh(struct wiphy *wiphy, struct net_device *dev)