mac80211: drop the connection if firmware crashed while in CSA

Don't bother keeping the link in that case. It is way
too complicated to keep the connection.

Signed-off-by: Emmanuel Grumbach <[e-mail]>
Signed-off-by: Naftali Goldstein <[e-mail]>
Signed-off-by: Luca Coelho <[e-mail]>
Link: https://lore.kernel.org/r/iwlwifi.20210409123755.a126c8833398.I677bdac314dd50d90474a90593902c17f9410cc4@changeid
Signed-off-by: Johannes Berg <[e-mail]>

net/mac80211/ieee80211_i.h

···
 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata);
 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata);
 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata);
+void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
+				   u8 *bssid, u8 reason, bool tx);
 
 /* IBSS code */
 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local);

net/mac80211/main.c

···
  * Copyright 2006-2007	Jiri Benc <[e-mail]>
  * Copyright 2013-2014  Intel Mobile Communications GmbH
  * Copyright (C) 2017     Intel Deutschland GmbH
- * Copyright (C) 2018 - 2019 Intel Corporation
+ * Copyright (C) 2018-2021 Intel Corporation
  */
 
 #include <net/mac80211.h>
···
 			 * Then we can have a race...
 			 */
 			cancel_work_sync(&sdata->u.mgd.csa_connection_drop_work);
+			if (sdata->vif.csa_active) {
+				sdata_lock(sdata);
+				ieee80211_sta_connection_lost(sdata,
+							      sdata->u.mgd.associated->bssid,
+							      WLAN_REASON_UNSPECIFIED, false);
+				sdata_unlock(sdata);
+			}
 		}
 		flush_delayed_work(&sdata->dec_tailroom_needed_wk);
 	}

net/mac80211/mlme.c

···
 	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 }
 
-static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
-					  u8 *bssid, u8 reason, bool tx)
+void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
+				   u8 *bssid, u8 reason, bool tx)
 {
 	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];