1 files changed, 31 insertions, 9 deletions

diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index 22b3d9990065..cd29366a5206 100644
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -745,6 +745,12 @@ bool cfg80211_rx_mgmt(struct wireless_dev *wdev, int freq, int sig_mbm,
 }
 EXPORT_SYMBOL(cfg80211_rx_mgmt);
 
+void cfg80211_sched_dfs_chan_update(struct cfg80211_registered_device *rdev)
+{
+	cancel_delayed_work(&rdev->dfs_update_channels_wk);
+	queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk, 0);
+}
+
 void cfg80211_dfs_channels_update_work(struct work_struct *work)
 {
 	struct delayed_work *delayed_work = to_delayed_work(work);
@@ -755,6 +761,8 @@ void cfg80211_dfs_channels_update_work(struct work_struct *work)
 	struct wiphy *wiphy;
 	bool check_again = false;
 	unsigned long timeout, next_time = 0;
+	unsigned long time_dfs_update;
+	enum nl80211_radar_event radar_event;
 	int bandid, i;
 
 	rdev = container_of(delayed_work, struct cfg80211_registered_device,
@@ -770,11 +778,27 @@ void cfg80211_dfs_channels_update_work(struct work_struct *work)
 		for (i = 0; i < sband->n_channels; i++) {
 			c = &sband->channels[i];
 
-			if (c->dfs_state != NL80211_DFS_UNAVAILABLE)
+			if (!(c->flags & IEEE80211_CHAN_RADAR))
+				continue;
+
+			if (c->dfs_state != NL80211_DFS_UNAVAILABLE &&
+			    c->dfs_state != NL80211_DFS_AVAILABLE)
 				continue;
 
-			timeout = c->dfs_state_entered + msecs_to_jiffies(
-					IEEE80211_DFS_MIN_NOP_TIME_MS);
+			if (c->dfs_state == NL80211_DFS_UNAVAILABLE) {
+				time_dfs_update = IEEE80211_DFS_MIN_NOP_TIME_MS;
+				radar_event = NL80211_RADAR_NOP_FINISHED;
+			} else {
+				if (regulatory_pre_cac_allowed(wiphy) ||
+				    cfg80211_any_wiphy_oper_chan(wiphy, c))
+					continue;
+
+				time_dfs_update = REG_PRE_CAC_EXPIRY_GRACE_MS;
+				radar_event = NL80211_RADAR_PRE_CAC_EXPIRED;
+			}
+
+			timeout = c->dfs_state_entered +
+				  msecs_to_jiffies(time_dfs_update);
 
 			if (time_after_eq(jiffies, timeout)) {
 				c->dfs_state = NL80211_DFS_USABLE;
@@ -784,8 +808,8 @@ void cfg80211_dfs_channels_update_work(struct work_struct *work)
 							NL80211_CHAN_NO_HT);
 
 				nl80211_radar_notify(rdev, &chandef,
-						     NL80211_RADAR_NOP_FINISHED,
-						     NULL, GFP_ATOMIC);
+						     radar_event, NULL,
+						     GFP_ATOMIC);
 				continue;
 			}
 
@@ -810,7 +834,6 @@ void cfg80211_radar_event(struct wiphy *wiphy,
 			  gfp_t gfp)
 {
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
-	unsigned long timeout;
 
 	trace_cfg80211_radar_event(wiphy, chandef);
 
@@ -820,9 +843,7 @@ void cfg80211_radar_event(struct wiphy *wiphy,
 	 */
 	cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_UNAVAILABLE);
 
-	timeout = msecs_to_jiffies(IEEE80211_DFS_MIN_NOP_TIME_MS);
-	queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
-			   timeout);
+	cfg80211_sched_dfs_chan_update(rdev);
 
 	nl80211_radar_notify(rdev, chandef, NL80211_RADAR_DETECTED, NULL, gfp);
 }
@@ -851,6 +872,7 @@ void cfg80211_cac_event(struct net_device *netdev,
 			  msecs_to_jiffies(wdev->cac_time_ms);
 		WARN_ON(!time_after_eq(jiffies, timeout));
 		cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
+		cfg80211_sched_dfs_chan_update(rdev);
 		break;
 	case NL80211_RADAR_CAC_ABORTED:
 		break;