mac80211: call driver method when restart completes

When the driver requests a restart (reconfiguration) it
gets all the normal method calls, but can't really tell
why they're happening. Call a new restart_complete op
in the driver when the restart completes, so it could
keep its own state about the restart and clear it there.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 23803ad..e1d8309 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -2400,6 +2400,10 @@
  *	just "paused" for scanning/ROC, which is indicated by the beacon being
  *	disabled/enabled via @bss_info_changed.
  * @stop_ap: Stop operation on the AP interface.
+ *
+ * @restart_complete: Called after a call to ieee80211_restart_hw(), when the
+ *	reconfiguration has completed. This can help the driver implement the
+ *	reconfiguration step. This callback may sleep.
  */
 struct ieee80211_ops {
 	void (*tx)(struct ieee80211_hw *hw,
@@ -2561,6 +2565,8 @@
 	void (*unassign_vif_chanctx)(struct ieee80211_hw *hw,
 				     struct ieee80211_vif *vif,
 				     struct ieee80211_chanctx_conf *ctx);
+
+	void (*restart_complete)(struct ieee80211_hw *hw);
 };
 
 /**