mac80211: TDLS: handle chan-switch in RTNL locked work

Move TDLS channel-switch Rx handling into an RTNL locked work. This is
required to add proper regulatory checking to incoming channel-switch
requests.
Queue incoming requests in a dedicated skb queue and handle the request
in a device-specific work to avoid deadlocking on interface removal.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/ieee80211_i.h

@@ -1008,7 +1008,6 @@ enum sdata_queue_type {
 	IEEE80211_SDATA_QUEUE_AGG_STOP		= 2,
 	IEEE80211_SDATA_QUEUE_RX_AGG_START	= 3,
 	IEEE80211_SDATA_QUEUE_RX_AGG_STOP	= 4,
-	IEEE80211_SDATA_QUEUE_TDLS_CHSW		= 5,
 };
 
 enum {
@@ -1351,6 +1350,10 @@ struct ieee80211_local {
 
 	/* extended capabilities provided by mac80211 */
 	u8 ext_capa[8];
+
+	/* TDLS channel switch */
+	struct work_struct tdls_chsw_work;
+	struct sk_buff_head skb_queue_tdls_chsw;
 };
 
 static inline struct ieee80211_sub_if_data *
@@ -2054,9 +2057,8 @@ int ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
 void ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
 					  struct net_device *dev,
 					  const u8 *addr);
-void ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
-					   struct sk_buff *skb);
 void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata);
+void ieee80211_tdls_chsw_work(struct work_struct *wk);
 
 extern const struct ethtool_ops ieee80211_ethtool_ops;