mac80211: use common work struct

IBSS, managed and mesh modes all have their
own work struct, and in the future we want
to also use it in other modes to process
frames from the now common skb queue.

This also makes the skb queue and work safe
to use from other interface types.

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

net/mac80211/pm.c

@@ -64,6 +64,8 @@ int __ieee80211_suspend(struct ieee80211_hw *hw)
 
 	/* remove all interfaces */
 	list_for_each_entry(sdata, &local->interfaces, list) {
+		cancel_work_sync(&sdata->work);
+
 		switch(sdata->vif.type) {
 		case NL80211_IFTYPE_STATION:
 			ieee80211_sta_quiesce(sdata);