mac80211: notify mac from low level driver (iwlwifi)

Add new API to MAC80211 to allow low level driver to
notify MAC with driver status.
Signed-off-by: Mohamed Abbas <mabbas@linux.intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl3945-base.c

@@ -5886,6 +5886,7 @@ static void iwl3945_alive_start(struct iwl3945_priv *priv)
 	if (priv->error_recovering)
 		iwl3945_error_recovery(priv);
 
+	ieee80211_notify_mac(priv->hw, IEEE80211_NOTIFY_RE_ASSOC);
 	return;
 
  restart:

drivers/net/wireless/iwlwifi/iwl4965-base.c

@@ -5714,6 +5714,7 @@ static void iwl4965_alive_start(struct iwl_priv *priv)
 		iwl4965_error_recovery(priv);
 
 	iwlcore_low_level_notify(priv, IWLCORE_START_EVT);
+	ieee80211_notify_mac(priv->hw, IEEE80211_NOTIFY_RE_ASSOC);
 	return;
 
  restart:

include/net/mac80211.h

@@ -73,6 +73,14 @@
  * not do so then mac80211 may add this under certain circumstances.
  */
 
+/**
+ * enum ieee80211_notification_type - Low level driver notification
+ * @IEEE80211_NOTIFY_RE_ASSOC: start the re-association sequence
+ */
+enum ieee80211_notification_types {
+	IEEE80211_NOTIFY_RE_ASSOC,
+};
+
 /**
  * struct ieee80211_ht_bss_info - describing BSS's HT characteristics
  *
@@ -1678,4 +1686,15 @@ void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid);
 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, const u8 *ra,
 				     u16 tid);
 
+/**
+ * ieee80211_notify_mac - low level driver notification
+ * @hw: pointer as obtained from ieee80211_alloc_hw().
+ * @notification_types: enum ieee80211_notification_types
+ *
+ * This function must be called by low level driver to inform mac80211 of
+ * low level driver status change or force mac80211 to re-assoc for low
+ * level driver internal error that require re-assoc.
+ */
+void ieee80211_notify_mac(struct ieee80211_hw *hw,
+			  enum ieee80211_notification_types  notif_type);
 #endif /* MAC80211_H */

net/mac80211/ieee80211_sta.c

@@ -4225,3 +4225,26 @@ int ieee80211_sta_disassociate(struct net_device *dev, u16 reason)
 	ieee80211_set_disassoc(dev, ifsta, 0);
 	return 0;
 }
+
+void ieee80211_notify_mac(struct ieee80211_hw *hw,
+			  enum ieee80211_notification_types  notif_type)
+{
+	struct ieee80211_local *local = hw_to_local(hw);
+	struct ieee80211_sub_if_data *sdata;
+
+	switch (notif_type) {
+	case IEEE80211_NOTIFY_RE_ASSOC:
+		rcu_read_lock();
+		list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+
+			if (sdata->vif.type == IEEE80211_IF_TYPE_STA) {
+				ieee80211_sta_req_auth(sdata->dev,
+						       &sdata->u.sta);
+			}
+
+		}
+		rcu_read_unlock();
+		break;
+	}
+}
+EXPORT_SYMBOL(ieee80211_notify_mac);