cfg80211: schedule offchan_cac_abort_wk in cfg80211_radar_event

If necessary schedule offchan_cac_abort_wk work in cfg80211_radar_event
routine adding offchan parameter to cfg80211_radar_event signature.
Rename cfg80211_radar_event in __cfg80211_radar_event and introduce
the two following inline helpers:
- cfg80211_radar_event
- cfg80211_offchan_radar_event
Doing so the drv will not need to run cfg80211_offchan_cac_abort() after
radar detection on the offchannel chain.
Tested-by: Owen Peng <owen.peng@mediatek.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/3ff583e021e3343a3ced54a7b09b5e184d1880dc.1637062727.git.lorenzo@kernel.orgSigned-off-by: Johannes Berg <johannes.berg@intel.com>

include/net/cfg80211.h

@@ -7605,15 +7605,33 @@ void cfg80211_cqm_txe_notify(struct net_device *dev, const u8 *peer,
 void cfg80211_cqm_beacon_loss_notify(struct net_device *dev, gfp_t gfp);
 
 /**
- * cfg80211_radar_event - radar detection event
+ * __cfg80211_radar_event - radar detection event
  * @wiphy: the wiphy
  * @chandef: chandef for the current channel
+ * @offchan: the radar has been detected on the offchannel chain
  * @gfp: context flags
  *
  * This function is called when a radar is detected on the current chanenl.
  */
-void cfg80211_radar_event(struct wiphy *wiphy,
-			  struct cfg80211_chan_def *chandef, gfp_t gfp);
+void __cfg80211_radar_event(struct wiphy *wiphy,
+			    struct cfg80211_chan_def *chandef,
+			    bool offchan, gfp_t gfp);
+
+static inline void
+cfg80211_radar_event(struct wiphy *wiphy,
+		     struct cfg80211_chan_def *chandef,
+		     gfp_t gfp)
+{
+	__cfg80211_radar_event(wiphy, chandef, false, gfp);
+}
+
+static inline void
+cfg80211_offchan_radar_event(struct wiphy *wiphy,
+			     struct cfg80211_chan_def *chandef,
+			     gfp_t gfp)
+{
+	__cfg80211_radar_event(wiphy, chandef, true, gfp);
+}
 
 /**
  * cfg80211_sta_opmode_change_notify - STA's ht/vht operation mode change event

net/wireless/mlme.c

@@ -905,13 +905,13 @@ void cfg80211_dfs_channels_update_work(struct work_struct *work)
 }
 
 
-void cfg80211_radar_event(struct wiphy *wiphy,
-			  struct cfg80211_chan_def *chandef,
-			  gfp_t gfp)
+void __cfg80211_radar_event(struct wiphy *wiphy,
+			    struct cfg80211_chan_def *chandef,
+			    bool offchan, gfp_t gfp)
 {
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 
-	trace_cfg80211_radar_event(wiphy, chandef);
+	trace_cfg80211_radar_event(wiphy, chandef, offchan);
 
 	/* only set the chandef supplied channel to unavailable, in
 	 * case the radar is detected on only one of multiple channels
@@ -919,6 +919,9 @@ void cfg80211_radar_event(struct wiphy *wiphy,
 	 */
 	cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_UNAVAILABLE);
 
+	if (offchan)
+		queue_work(cfg80211_wq, &rdev->offchan_cac_abort_wk);
+
 	cfg80211_sched_dfs_chan_update(rdev);
 
 	nl80211_radar_notify(rdev, chandef, NL80211_RADAR_DETECTED, NULL, gfp);
@@ -926,7 +929,7 @@ void cfg80211_radar_event(struct wiphy *wiphy,
 	memcpy(&rdev->radar_chandef, chandef, sizeof(struct cfg80211_chan_def));
 	queue_work(cfg80211_wq, &rdev->propagate_radar_detect_wk);
 }
-EXPORT_SYMBOL(cfg80211_radar_event);
+EXPORT_SYMBOL(__cfg80211_radar_event);
 
 void cfg80211_cac_event(struct net_device *netdev,
 			const struct cfg80211_chan_def *chandef,
@@ -998,7 +1001,8 @@ __cfg80211_offchan_cac_event(struct cfg80211_registered_device *rdev,
 		rdev->offchan_radar_wdev = NULL;
 		break;
 	case NL80211_RADAR_CAC_ABORTED:
-		cancel_delayed_work(&rdev->offchan_cac_done_wk);
+		if (!cancel_delayed_work(&rdev->offchan_cac_done_wk))
+			return;
 		wdev = rdev->offchan_radar_wdev;
 		rdev->offchan_radar_wdev = NULL;
 		break;

net/wireless/trace.h

@@ -3053,18 +3053,21 @@ TRACE_EVENT(cfg80211_ch_switch_started_notify,
 );
 
 TRACE_EVENT(cfg80211_radar_event,
-	TP_PROTO(struct wiphy *wiphy, struct cfg80211_chan_def *chandef),
-	TP_ARGS(wiphy, chandef),
+	TP_PROTO(struct wiphy *wiphy, struct cfg80211_chan_def *chandef,
+		 bool offchan),
+	TP_ARGS(wiphy, chandef, offchan),
 	TP_STRUCT__entry(
 		WIPHY_ENTRY
 		CHAN_DEF_ENTRY
+		__field(bool, offchan)
 	),
 	TP_fast_assign(
 		WIPHY_ASSIGN;
 		CHAN_DEF_ASSIGN(chandef);
+		__entry->offchan = offchan;
 	),
-	TP_printk(WIPHY_PR_FMT ", " CHAN_DEF_PR_FMT,
-		  WIPHY_PR_ARG, CHAN_DEF_PR_ARG)
+	TP_printk(WIPHY_PR_FMT ", " CHAN_DEF_PR_FMT ", offchan %d",
+		  WIPHY_PR_ARG, CHAN_DEF_PR_ARG, __entry->offchan)
 );
 
 TRACE_EVENT(cfg80211_cac_event,