wifi: mac80211: use wiphy work for SMPS

SMPS requests are per link, and currently there's a potential
deadlock with canceling. Use the new wiphy work to handle SMPS
instead, so that the cancel cannot deadlock.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Author: jmberg-intel

net/mac80211/ht.c

@@ -9,7 +9,7 @@
  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
  * Copyright 2007-2010, Intel Corporation
  * Copyright 2017	Intel Deutschland GmbH
- * Copyright(c) 2020-2022 Intel Corporation
+ * Copyright(c) 2020-2023 Intel Corporation
  */
 
 #include <linux/ieee80211.h>
@@ -602,7 +602,8 @@ void ieee80211_request_smps(struct ieee80211_vif *vif, unsigned int link_id,
 		goto out;
 
 	link->u.mgd.driver_smps_mode = smps_mode;
-	ieee80211_queue_work(&sdata->local->hw, &link->u.mgd.request_smps_work);
+	wiphy_work_queue(sdata->local->hw.wiphy,
+			 &link->u.mgd.request_smps_work);
 out:
 	rcu_read_unlock();
 }

net/mac80211/ieee80211_i.h

@@ -921,7 +921,7 @@ struct ieee80211_link_data_managed {
 	struct timer_list chswitch_timer;
 	struct work_struct chswitch_work;
 
-	struct work_struct request_smps_work;
+	struct wiphy_work request_smps_work;
 	bool beacon_crc_valid;
 	u32 beacon_crc;
 	struct ewma_beacon_signal ave_beacon_signal;

net/mac80211/mlme.c

@@ -6538,7 +6538,8 @@ void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
 	sdata_unlock(sdata);
 }
 
-static void ieee80211_request_smps_mgd_work(struct work_struct *work)
+static void ieee80211_request_smps_mgd_work(struct wiphy *wiphy,
+					    struct wiphy_work *work)
 {
 	struct ieee80211_link_data *link =
 		container_of(work, struct ieee80211_link_data,
@@ -6588,8 +6589,8 @@ void ieee80211_mgd_setup_link(struct ieee80211_link_data *link)
 	link->u.mgd.conn_flags = 0;
 	link->conf->bssid = link->u.mgd.bssid;
 
-	INIT_WORK(&link->u.mgd.request_smps_work,
-		  ieee80211_request_smps_mgd_work);
+	wiphy_work_init(&link->u.mgd.request_smps_work,
+			ieee80211_request_smps_mgd_work);
 	if (local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
 		link->u.mgd.req_smps = IEEE80211_SMPS_AUTOMATIC;
 	else
@@ -7552,7 +7553,8 @@ int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
 
 void ieee80211_mgd_stop_link(struct ieee80211_link_data *link)
 {
-	cancel_work_sync(&link->u.mgd.request_smps_work);
+	wiphy_work_cancel(link->sdata->local->hw.wiphy,
+			  &link->u.mgd.request_smps_work);
 	cancel_work_sync(&link->u.mgd.chswitch_work);
 }
 

net/mac80211/tdls.c

@@ -1431,8 +1431,8 @@ int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
 	}
 
 	if (ret == 0)
-		ieee80211_queue_work(&sdata->local->hw,
-				     &sdata->deflink.u.mgd.request_smps_work);
+		wiphy_work_queue(sdata->local->hw.wiphy,
+				 &sdata->deflink.u.mgd.request_smps_work);
 
 	mutex_unlock(&local->mtx);
 	sdata_unlock(sdata);