mac80211: optimise AP stop RCU handling
If there are VLANs, stopping an AP is inefficient as it
calls rcu_barrier() once for each interface (the VLANs
and the AP itself). Optimise this by moving rcu_barrier()
out of the station cleanups and calling it only once for
all interfaces combined.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index be01953..908f115 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1010,8 +1010,13 @@
kfree_rcu(old_probe_resp, rcu_head);
list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
- sta_info_flush(vlan);
- sta_info_flush(sdata);
+ sta_info_flush_defer(vlan);
+ sta_info_flush_defer(sdata);
+ rcu_barrier();
+ list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
+ sta_info_flush_cleanup(vlan);
+ sta_info_flush_cleanup(sdata);
+
ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
drv_stop_ap(sdata->local, sdata);