recipes-wifi/linux-mac80211/files/patches-6.x/subsys/0037-mac80211-mtk-ACS-channel-time-is-reset-by-ch_restore.patch

From 9c1106eb80f31723780a6eb098b5c146a33d45a2 Mon Sep 17 00:00:00 2001
From: "fancy.liu" <fancy.liu@mediatek.com>
Date: Wed, 29 Nov 2023 13:51:13 +0800
Subject: [PATCH 37/61] mac80211: mtk: ACS channel time is reset by ch_restore

Issue:
There's a chance that the channel time for duty channel is zero in ACS
scan.

Root cause:
The chan_stat may be reset when restore to duty channel.
Mac80211 will notify to hostapd when scan done and then restore to duty
channel.
And mt76 will clear scan flag after restore done.
If hostapd get the chan_stat before channel_restore, will get the
correct channel time;
If hostapd get the chan_stat after channel_restore, will get zero
channel time;

Solution:
When channel switch, will check the mac80211 scan state but not the mt76 scan flag.
Mac80211 scan state will be set in scanning, and will be reset after
scan done and before restore to duty channel.

CR-Id: WCNCR00357653
Signed-off-by: fancy.liu <fancy.liu@mediatek.com>
Change-Id: I480a956c8a362929040d941247d74ff0e5d06ffb
---
 include/net/mac80211.h | 7 +++++++
 net/mac80211/util.c    | 9 +++++++++
 2 files changed, 16 insertions(+)

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 89bba19..d7b1f9d 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -7665,4 +7665,11 @@ int ieee80211_emulate_switch_vif_chanctx(struct ieee80211_hw *hw,
 					 int n_vifs,
 					 enum ieee80211_chanctx_switch_mode mode);
 
+/**
+ * ieee80211_get_scanning - get scanning bitmask
+ *
+ * @hw: pointer as obtained from ieee80211_alloc_hw()
+ */
+unsigned long ieee80211_get_scanning(struct ieee80211_hw *hw);
+
 #endif /* MAC80211_H */
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index dd06bd2..55f1566 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -4340,3 +4340,12 @@ ieee80211_min_bw_limit_from_chandef(struct cfg80211_chan_def *chandef)
 		return IEEE80211_CONN_BW_LIMIT_20;
 	}
 }
+
+unsigned long ieee80211_get_scanning(struct ieee80211_hw *hw)
+{
+	struct ieee80211_local *local = hw_to_local(hw);
+
+	return local->scanning;
+}
+EXPORT_SYMBOL(ieee80211_get_scanning);
+
-- 
2.39.2