rtw88: LPS enter/leave should be protected by lock

Protect LPS enter/leave routine with rtwdev->mutex.
This helps to synchronize with driver's states correctly.

Signed-off-by: Yan-Hsuan Chuang <yhchuang@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/realtek/rtw88/mac80211.c

@@ -464,10 +464,10 @@ static void rtw_ops_sw_scan_start(struct ieee80211_hw *hw,
 	struct rtw_vif *rtwvif = (struct rtw_vif *)vif->drv_priv;
 	u32 config = 0;
 
-	rtw_leave_lps(rtwdev);
-
 	mutex_lock(&rtwdev->mutex);
 
+	rtw_leave_lps(rtwdev);
+
 	ether_addr_copy(rtwvif->mac_addr, mac_addr);
 	config |= PORT_SET_MAC_ADDR;
 	rtw_vif_port_config(rtwdev, rtwvif, config);

drivers/net/wireless/realtek/rtw88/main.c

@@ -152,8 +152,10 @@ static void rtw_watch_dog_work(struct work_struct *work)
 	struct rtw_watch_dog_iter_data data = {};
 	bool busy_traffic = test_bit(RTW_FLAG_BUSY_TRAFFIC, rtwdev->flags);
 
+	mutex_lock(&rtwdev->mutex);
+
 	if (!test_bit(RTW_FLAG_RUNNING, rtwdev->flags))
-		return;
+		goto unlock;
 
 	ieee80211_queue_delayed_work(rtwdev->hw, &rtwdev->watch_dog_work,
 				     RTW_WATCH_DOG_DELAY_TIME);
@@ -186,11 +188,14 @@ static void rtw_watch_dog_work(struct work_struct *work)
 		rtw_leave_lps(rtwdev);
 
 	if (test_bit(RTW_FLAG_SCANNING, rtwdev->flags))
-		return;
+		goto unlock;
 
 	rtw_phy_dynamic_mechanism(rtwdev);
 
 	rtwdev->watch_dog_cnt++;
+
+unlock:
+	mutex_unlock(&rtwdev->mutex);
 }
 
 static void rtw_c2h_work(struct work_struct *work)

drivers/net/wireless/realtek/rtw88/ps.c

@@ -95,6 +95,8 @@ void rtw_enter_lps(struct rtw_dev *rtwdev, u8 port_id)
 {
 	struct rtw_lps_conf *conf = &rtwdev->lps_conf;
 
+	lockdep_assert_held(&rtwdev->mutex);
+
 	if (test_bit(RTW_FLAG_LEISURE_PS, rtwdev->flags))
 		return;
 
@@ -108,6 +110,8 @@ void rtw_leave_lps(struct rtw_dev *rtwdev)
 {
 	struct rtw_lps_conf *conf = &rtwdev->lps_conf;
 
+	lockdep_assert_held(&rtwdev->mutex);
+
 	if (!test_bit(RTW_FLAG_LEISURE_PS, rtwdev->flags))
 		return;