wifi: cfg80211: Schedule regulatory check on BSS STA channel change

Due to different relaxation policies it may be needed to re-check
channels after a BSS station interface is disconnected or performed a
channel switch.
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Reviewed-by: Gregory Greenman <gregory.greenman@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20231220133549.1f2f8475bcf1.I1879d259d8d756159c8060f61f4bce172e6d323e@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

include/net/cfg80211.h

@@ -9391,6 +9391,16 @@ bool cfg80211_valid_disable_subchannel_bitmap(u16 *bitmap,
  */
 void cfg80211_links_removed(struct net_device *dev, u16 link_mask);
 
+/**
+ * cfg80211_schedule_channels_check - schedule regulatory check if needed
+ * @wdev: the wireless device to check
+ *
+ * In case the device supports NO_IR or DFS relaxations, schedule regulatory
+ * channels check, as previous concurrent operation conditions may not
+ * hold anymore.
+ */
+void cfg80211_schedule_channels_check(struct wireless_dev *wdev);
+
 #ifdef CONFIG_CFG80211_DEBUGFS
 /**
  * wiphy_locked_debugfs_read - do a locked read in debugfs

net/wireless/nl80211.c

@@ -19474,6 +19474,7 @@ void cfg80211_ch_switch_notify(struct net_device *dev,
 		break;
 	}
 
+	cfg80211_schedule_channels_check(wdev);
 	cfg80211_sched_dfs_chan_update(rdev);
 
 	nl80211_ch_switch_notify(rdev, dev, link_id, chandef, GFP_KERNEL,
@@ -20231,6 +20232,20 @@ void cfg80211_update_owe_info_event(struct net_device *netdev,
 }
 EXPORT_SYMBOL(cfg80211_update_owe_info_event);
 
+void cfg80211_schedule_channels_check(struct wireless_dev *wdev)
+{
+	struct wiphy *wiphy = wdev->wiphy;
+
+	/* Schedule channels check if NO_IR or DFS relaxations are supported */
+	if (wdev->iftype == NL80211_IFTYPE_STATION &&
+	    (wiphy_ext_feature_isset(wiphy,
+				     NL80211_EXT_FEATURE_DFS_CONCURRENT) ||
+	    (IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) &&
+	     wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR)))
+		reg_check_channels();
+}
+EXPORT_SYMBOL(cfg80211_schedule_channels_check);
+
 /* initialisation/exit functions */
 
 int __init nl80211_init(void)

net/wireless/reg.c

@@ -2480,7 +2480,7 @@ static void reg_check_chans_work(struct work_struct *work)
 	rtnl_unlock();
 }
 
-static void reg_check_channels(void)
+void reg_check_channels(void)
 {
 	/*
 	 * Give usermode a chance to do something nicer (move to another

net/wireless/reg.h

@@ -181,6 +181,11 @@ bool reg_dfs_domain_same(struct wiphy *wiphy1, struct wiphy *wiphy2);
  */
 int reg_reload_regdb(void);
 
+/**
+ * reg_check_channels - schedule regulatory enforcement
+ */
+void reg_check_channels(void);
+
 extern const u8 shipped_regdb_certs[];
 extern unsigned int shipped_regdb_certs_len;
 extern const u8 extra_regdb_certs[];

net/wireless/sme.c

@@ -1394,6 +1394,8 @@ void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 #endif
 
 	schedule_work(&cfg80211_disconnect_work);
+
+	cfg80211_schedule_channels_check(wdev);
 }
 
 void cfg80211_disconnected(struct net_device *dev, u16 reason,