wireless extensions: make netns aware

This makes wireless extensions netns aware. The
tasklet sending the events is converted to a work
struct so that we can rtnl_lock() in it.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/net_namespace.h

@@ -79,6 +79,9 @@ struct net {
 #endif
 #ifdef CONFIG_XFRM
 	struct netns_xfrm	xfrm;
+#endif
+#ifdef CONFIG_WIRELESS_EXT
+	struct sk_buff_head	wext_nlevents;
 #endif
 	struct net_generic	*gen;
 };