mac80211: add sta_state callback

(based on Eliad's patch)

Add a callback to notify the low-level driver whenever
the state of a station changes. The driver is only
notified when the station is actually in the mac80211
hash table, not for pre-insert state transitions.

To allow the driver to replace sta_add/remove calls
with this, call extra transitions with the NOTEXIST
state.

This callback can fail, so we need to be careful in
handling it when a station is inserted, particularly
in the IBSS case where we still keep the station entry
around for mac80211 purposes.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/net/mac80211/pm.c b/net/mac80211/pm.c
index c65ff471acce..af49ac4f0826 100644
--- a/net/mac80211/pm.c
+++ b/net/mac80211/pm.c
@@ -97,9 +97,17 @@ int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
         /* tear down aggregation sessions and remove STAs */
         mutex_lock(&local->sta_mtx);
         list_for_each_entry(sta, &local->sta_list, list) {
-                if (sta->uploaded)
+                if (sta->uploaded) {
+                        enum ieee80211_sta_state state;
+
                         drv_sta_remove(local, sta->sdata, &sta->sta);
 
+                        state = sta->sta_state;
+                        for (; state > IEEE80211_STA_NOTEXIST; state--)
+                                WARN_ON(drv_sta_state(local, sdata, sta,
+                                                      state, state - 1));
+                }
+
                 mesh_plink_quiesce(sta);
         }
         mutex_unlock(&local->sta_mtx);