cfg80211: add channel switch notify event

The firmware may decide to switch channels while already beaconing, e.g.
in response to a cfg80211 connect request on a different vif. Add this
event to notify userspace when an AP or GO interface has successfully
migrated to a new channel, so it can update its configuration
accordingly.

Signed-off-by: Thomas Pedersen <c_tpeder@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index c6d2632..1335084 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -548,6 +548,11 @@
  * @NL80211_CMD_SET_NOACK_MAP: sets a bitmap for the individual TIDs whether
  *      No Acknowledgement Policy should be applied.
  *
+ * @NL80211_CMD_CH_SWITCH_NOTIFY: An AP or GO may decide to switch channels
+ *	independently of the userspace SME, send this event indicating
+ *	%NL80211_ATTR_IFINDEX is now on %NL80211_ATTR_WIPHY_FREQ with
+ *	%NL80211_ATTR_WIPHY_CHANNEL_TYPE.
+ *
  * @NL80211_CMD_MAX: highest used command number
  * @__NL80211_CMD_AFTER_LAST: internal use
  */
@@ -689,6 +694,8 @@
 
 	NL80211_CMD_SET_NOACK_MAP,
 
+	NL80211_CMD_CH_SWITCH_NOTIFY,
+
 	/* add new commands above here */
 
 	/* used to define NL80211_CMD_MAX below */