Just a small update:

* fix the deadlock on rfkill/wireless removal that a few
    people reported
  * fix an uninitialized variable
  * update wiki URLs
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Merge tag 'mac80211-for-davem-2020-06-08' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211

Johannes Berg says:

====================
Just a small update:
 * fix the deadlock on rfkill/wireless removal that a few
   people reported
 * fix an uninitialized variable
 * update wiki URLs
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/networking/mac80211-injection.rst

@@ -101,6 +101,6 @@ interface), along the following lines:::
 
 You can also find a link to a complete inject application here:
 
-http://wireless.kernel.org/en/users/Documentation/packetspammer
+https://wireless.wiki.kernel.org/en/users/Documentation/packetspammer
 
 Andy Green <andy@warmcat.com>

Documentation/networking/regulatory.rst

@@ -9,7 +9,7 @@ regulatory infrastructure works.
 
 More up to date information can be obtained at the project's web page:
 
-http://wireless.kernel.org/en/developers/Regulatory
+https://wireless.wiki.kernel.org/en/developers/Regulatory
 
 Keeping regulatory domains in userspace
 ---------------------------------------
@@ -37,7 +37,7 @@ expected regulatory domains will be respected by the kernel.
 A currently available userspace agent which can accomplish this
 is CRDA - central regulatory domain agent. Its documented here:
 
-http://wireless.kernel.org/en/developers/Regulatory/CRDA
+https://wireless.wiki.kernel.org/en/developers/Regulatory/CRDA
 
 Essentially the kernel will send a udev event when it knows
 it needs a new regulatory domain. A udev rule can be put in place
@@ -58,7 +58,7 @@ Who asks for regulatory domains?
 
 Users can use iw:
 
-http://wireless.kernel.org/en/users/Documentation/iw
+https://wireless.wiki.kernel.org/en/users/Documentation/iw
 
 An example::
 

include/net/cfg80211.h

@@ -5075,7 +5075,8 @@ struct cfg80211_cqm_config;
  *	by cfg80211 on change_interface
  * @mgmt_registrations: list of registrations for management frames
  * @mgmt_registrations_lock: lock for the list
- * @mgmt_registrations_update_wk: update work to defer from atomic context
+ * @mgmt_registrations_need_update: mgmt registrations were updated,
+ *	need to propagate the update to the driver
  * @mtx: mutex used to lock data in this struct, may be used by drivers
  *	and some API functions require it held
  * @beacon_interval: beacon interval used on this device for transmitting
@@ -5121,7 +5122,7 @@ struct wireless_dev {
 
 	struct list_head mgmt_registrations;
 	spinlock_t mgmt_registrations_lock;
-	struct work_struct mgmt_registrations_update_wk;
+	u8 mgmt_registrations_need_update:1;
 
 	struct mutex mtx;
 

include/uapi/linux/nl80211.h

@@ -794,7 +794,7 @@
  *	various triggers. These triggers can be configured through this
  *	command with the %NL80211_ATTR_WOWLAN_TRIGGERS attribute. For
  *	more background information, see
- *	http://wireless.kernel.org/en/users/Documentation/WoWLAN.
+ *	https://wireless.wiki.kernel.org/en/users/Documentation/WoWLAN.
  *	The @NL80211_CMD_SET_WOWLAN command can also be used as a notification
  *	from the driver reporting the wakeup reason. In this case, the
  *	@NL80211_ATTR_WOWLAN_TRIGGERS attribute will contain the reason

net/mac80211/mlme.c

@@ -167,6 +167,8 @@ ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 			ret = IEEE80211_STA_DISABLE_HT |
 			      IEEE80211_STA_DISABLE_VHT |
 			      IEEE80211_STA_DISABLE_HE;
+		else
+			ret = 0;
 		vht_chandef = *chandef;
 		goto out;
 	}

net/mac80211/rx.c

@@ -4694,7 +4694,7 @@ void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
 			 * rate_idx is MCS index, which can be [0-76]
 			 * as documented on:
 			 *
-			 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
+			 * https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n
 			 *
 			 * Anything else would be some sort of driver or
 			 * hardware error. The driver should catch hardware

net/wireless/Kconfig

@@ -31,7 +31,7 @@ config CFG80211
 
 	  For more information refer to documentation on the wireless wiki:
 
-	  http://wireless.kernel.org/en/developers/Documentation/cfg80211
+	  https://wireless.wiki.kernel.org/en/developers/Documentation/cfg80211
 
 	  When built as a module it will be called cfg80211.
 

net/wireless/core.c

@@ -497,6 +497,8 @@ struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 	INIT_WORK(&rdev->propagate_radar_detect_wk,
 		  cfg80211_propagate_radar_detect_wk);
 	INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
+	INIT_WORK(&rdev->mgmt_registrations_update_wk,
+		  cfg80211_mgmt_registrations_update_wk);
 
 #ifdef CONFIG_CFG80211_DEFAULT_PS
 	rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
@@ -1047,6 +1049,7 @@ void wiphy_unregister(struct wiphy *wiphy)
 	flush_work(&rdev->sched_scan_stop_wk);
 	flush_work(&rdev->propagate_radar_detect_wk);
 	flush_work(&rdev->propagate_cac_done_wk);
+	flush_work(&rdev->mgmt_registrations_update_wk);
 
 #ifdef CONFIG_PM
 	if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
@@ -1108,7 +1111,6 @@ static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync)
 	rdev->devlist_generation++;
 
 	cfg80211_mlme_purge_registrations(wdev);
-	flush_work(&wdev->mgmt_registrations_update_wk);
 
 	switch (wdev->iftype) {
 	case NL80211_IFTYPE_P2P_DEVICE:
@@ -1253,8 +1255,6 @@ void cfg80211_init_wdev(struct cfg80211_registered_device *rdev,
 	spin_lock_init(&wdev->event_lock);
 	INIT_LIST_HEAD(&wdev->mgmt_registrations);
 	spin_lock_init(&wdev->mgmt_registrations_lock);
-	INIT_WORK(&wdev->mgmt_registrations_update_wk,
-		  cfg80211_mgmt_registrations_update_wk);
 	INIT_LIST_HEAD(&wdev->pmsr_list);
 	spin_lock_init(&wdev->pmsr_lock);
 	INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);

net/wireless/core.h

@@ -99,6 +99,8 @@ struct cfg80211_registered_device {
 	struct cfg80211_chan_def cac_done_chandef;
 	struct work_struct propagate_cac_done_wk;
 
+	struct work_struct mgmt_registrations_update_wk;
+
 	/* must be last because of the way we do wiphy_priv(),
 	 * and it should at least be aligned to NETDEV_ALIGN */
 	struct wiphy wiphy __aligned(NETDEV_ALIGN);

net/wireless/mlme.c

@@ -440,9 +440,15 @@ static void cfg80211_mgmt_registrations_update(struct wireless_dev *wdev)
 
 	ASSERT_RTNL();
 
+	spin_lock_bh(&wdev->mgmt_registrations_lock);
+	if (!wdev->mgmt_registrations_need_update) {
+		spin_unlock_bh(&wdev->mgmt_registrations_lock);
+		return;
+	}
+
 	rcu_read_lock();
 	list_for_each_entry_rcu(tmp, &rdev->wiphy.wdev_list, list) {
-		list_for_each_entry_rcu(reg, &tmp->mgmt_registrations, list) {
+		list_for_each_entry(reg, &tmp->mgmt_registrations, list) {
 			u32 mask = BIT(le16_to_cpu(reg->frame_type) >> 4);
 			u32 mcast_mask = 0;
 
@@ -460,16 +466,23 @@ static void cfg80211_mgmt_registrations_update(struct wireless_dev *wdev)
 	}
 	rcu_read_unlock();
 
+	wdev->mgmt_registrations_need_update = 0;
+	spin_unlock_bh(&wdev->mgmt_registrations_lock);
+
 	rdev_update_mgmt_frame_registrations(rdev, wdev, &upd);
 }
 
 void cfg80211_mgmt_registrations_update_wk(struct work_struct *wk)
 {
-	struct wireless_dev *wdev = container_of(wk, struct wireless_dev,
-						 mgmt_registrations_update_wk);
+	struct cfg80211_registered_device *rdev;
+	struct wireless_dev *wdev;
+
+	rdev = container_of(wk, struct cfg80211_registered_device,
+			    mgmt_registrations_update_wk);
 
 	rtnl_lock();
-	cfg80211_mgmt_registrations_update(wdev);
+	list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
+		cfg80211_mgmt_registrations_update(wdev);
 	rtnl_unlock();
 }
 
@@ -557,6 +570,7 @@ int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_portid,
 		nreg->multicast_rx = multicast_rx;
 		list_add(&nreg->list, &wdev->mgmt_registrations);
 	}
+	wdev->mgmt_registrations_need_update = 1;
 	spin_unlock_bh(&wdev->mgmt_registrations_lock);
 
 	cfg80211_mgmt_registrations_update(wdev);
@@ -585,7 +599,8 @@ void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlportid)
 		list_del(&reg->list);
 		kfree(reg);
 
-		schedule_work(&wdev->mgmt_registrations_update_wk);
+		wdev->mgmt_registrations_need_update = 1;
+		schedule_work(&rdev->mgmt_registrations_update_wk);
 	}
 
 	spin_unlock_bh(&wdev->mgmt_registrations_lock);
@@ -608,6 +623,7 @@ void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev)
 		list_del(&reg->list);
 		kfree(reg);
 	}
+	wdev->mgmt_registrations_need_update = 1;
 	spin_unlock_bh(&wdev->mgmt_registrations_lock);
 
 	cfg80211_mgmt_registrations_update(wdev);