mac80211: add post_channel_switch driver operation

As a counterpart to the pre_channel_switch operation, add a
post_channel_switch operation.  This allows the drivers to go back to
a normal configuration after the channel switch is completed.

Signed-off-by: Luciano Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 19e4159..7861ed8 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -2836,6 +2836,9 @@
  *	before a channel switch procedure is started (ie. when a STA
  *	gets a CSA or an userspace initiated channel-switch), allowing
  *	the driver to prepare for the channel switch.
+ * @post_channel_switch: This is an optional callback that is called
+ *	after a channel switch procedure is completed, allowing the
+ *	driver to go back to a normal configuration.
  *
  * @join_ibss: Join an IBSS (on an IBSS interface); this is called after all
  *	information in bss_conf is set up and the beacon can be retrieved. A
@@ -3046,6 +3049,9 @@
 				  struct ieee80211_vif *vif,
 				  struct ieee80211_channel_switch *ch_switch);
 
+	int (*post_channel_switch)(struct ieee80211_hw *hw,
+				   struct ieee80211_vif *vif);
+
 	int (*join_ibss)(struct ieee80211_hw *hw, struct ieee80211_vif *vif);
 	void (*leave_ibss)(struct ieee80211_hw *hw, struct ieee80211_vif *vif);
 	u32 (*get_expected_throughput)(struct ieee80211_sta *sta);