From 2cb021f5de55b1d158fa18b0215a4613c3289a82 Mon Sep 17 00:00:00 2001
From: Dmitry Lebed <dlebed@quantenna.com>
Date: Thu, 1 Mar 2018 12:39:16 +0300
Subject: [PATCH] cfg80211/nl80211: add CAC_STARTED event
Git-commit: 2cb021f5de55b1d158fa18b0215a4613c3289a82
Patch-mainline: v4.17-rc1
References: FATE#326294

CAC_STARTED event is needed for DFS offload feature and
should be generated by driver/HW if DFS_OFFLOAD is enabled.

Signed-off-by: Dmitry Lebed <dlebed@quantenna.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 include/uapi/linux/nl80211.h | 3 +++
 net/wireless/mlme.c          | 7 +++++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index c13c84304be3..b8e989073cbb 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -5204,6 +5204,8 @@ enum nl80211_smps_mode {
  *	non-operating channel is expired and no longer valid. New CAC must
  *	be done on this channel before starting the operation. This is not
  *	applicable for ETSI dfs domain where pre-CAC is valid for ever.
+ * @NL80211_RADAR_CAC_STARTED: Channel Availability Check has been started,
+ *	should be generated by HW if NL80211_EXT_FEATURE_DFS_OFFLOAD is enabled.
  */
 enum nl80211_radar_event {
 	NL80211_RADAR_DETECTED,
@@ -5211,6 +5213,7 @@ enum nl80211_radar_event {
 	NL80211_RADAR_CAC_ABORTED,
 	NL80211_RADAR_NOP_FINISHED,
 	NL80211_RADAR_PRE_CAC_EXPIRED,
+	NL80211_RADAR_CAC_STARTED,
 };
 
 /**
diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index bbb9907bfa86..6b6818dd76bd 100644
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -888,14 +888,17 @@ void cfg80211_cac_event(struct net_device *netdev,
 		       sizeof(struct cfg80211_chan_def));
 		queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk);
 		cfg80211_sched_dfs_chan_update(rdev);
-		break;
+		/* fall through */
 	case NL80211_RADAR_CAC_ABORTED:
+		wdev->cac_started = false;
+		break;
+	case NL80211_RADAR_CAC_STARTED:
+		wdev->cac_started = true;
 		break;
 	default:
 		WARN_ON(1);
 		return;
 	}
-	wdev->cac_started = false;
 
 	nl80211_radar_notify(rdev, chandef, event, netdev, gfp);
 }
-- 
2.19.2