diff --git a/os_dep/linux/ioctl_cfg80211.c b/os_dep/linux/ioctl_cfg80211.c
index a1ffca0..7aae542 100644
--- a/os_dep/linux/ioctl_cfg80211.c
+++ b/os_dep/linux/ioctl_cfg80211.c
@@ -5270,15 +5270,7 @@ exit:
 	return ret;
 }
 
-static int	cfg80211_rtw_del_station(struct wiphy *wiphy, struct net_device *ndev,
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0))
-	u8 *mac
-#elif (LINUX_VERSION_CODE < KERNEL_VERSION(3, 19, 0))
-	const u8 *mac
-#else
-	struct station_del_parameters *params
-#endif
-)
+static int	cfg80211_rtw_del_station(struct wiphy *wiphy, struct net_device *ndev, struct station_del_parameters *params)
 {
 	int ret = 0;
 	_irqL irqL;
@@ -5290,11 +5282,7 @@ static int	cfg80211_rtw_del_station(struct wiphy *wiphy, struct net_device *ndev
 	struct mlme_priv *pmlmepriv = &(padapter->mlmepriv);
 	struct sta_priv *pstapriv = &padapter->stapriv;
 
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 19, 0))
-	target_mac = mac;
-#else
 	target_mac = params->mac;
-#endif
 
 	RTW_INFO("+"FUNC_NDEV_FMT" mac=%pM\n", FUNC_NDEV_ARG(ndev), target_mac);
 
diff --git a/os_dep/linux/ioctl_cfg80211.h b/os_dep/linux/ioctl_cfg80211.h
index 54a319f..f57586d 100644
--- a/os_dep/linux/ioctl_cfg80211.h
+++ b/os_dep/linux/ioctl_cfg80211.h
@@ -354,12 +354,7 @@ void rtw_cfg80211_deinit_rfkill(struct wiphy *wiphy);
 #endif
 
 #define rtw_cfg80211_connect_result(wdev, bssid, req_ie, req_ie_len, resp_ie, resp_ie_len, status, gfp) cfg80211_connect_result(wdev_to_ndev(wdev), bssid, req_ie, req_ie_len, resp_ie, resp_ie_len, status, gfp)
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 2, 0))
-#define rtw_cfg80211_disconnected(wdev, reason, ie, ie_len, locally_generated, gfp) cfg80211_disconnected(wdev_to_ndev(wdev), reason, ie, ie_len, gfp)
-#else
 #define rtw_cfg80211_disconnected(wdev, reason, ie, ie_len, locally_generated, gfp) cfg80211_disconnected(wdev_to_ndev(wdev), reason, ie, ie_len, locally_generated, gfp)
-#endif
 
 #ifdef CONFIG_RTW_80211R
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 10, 0))
diff --git a/os_dep/linux/rtw_android.c b/os_dep/linux/rtw_android.c
index 8cde93c..8690883 100644
--- a/os_dep/linux/rtw_android.c
+++ b/os_dep/linux/rtw_android.c
@@ -1069,7 +1069,7 @@ void *wifi_get_country_code(char *ccode)
 	if (!ccode)
 		return NULL;
 	if (wifi_control_data && wifi_control_data->get_country_code)
-		return wifi_control_data->get_country_code(ccode);
+		return wifi_control_data->get_country_code(ccode, 0);
 	return NULL;
 }
 #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39)) */
diff --git a/os_dep/linux/rtw_cfgvendor.c b/os_dep/linux/rtw_cfgvendor.c
index 0f0f24f..7517491 100644
--- a/os_dep/linux/rtw_cfgvendor.c
+++ b/os_dep/linux/rtw_cfgvendor.c
@@ -45,11 +45,7 @@ struct sk_buff *dbg_rtw_cfg80211_vendor_event_alloc(struct wiphy *wiphy, struct
 	struct sk_buff *skb;
 	unsigned int truesize = 0;
 
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 1, 0))
-	skb = cfg80211_vendor_event_alloc(wiphy, len, event_id, gfp);
-#else
 	skb = cfg80211_vendor_event_alloc(wiphy, wdev, len, event_id, gfp);
-#endif
 
 	if (skb)
 		truesize = skb->truesize;
@@ -144,11 +140,8 @@ struct sk_buff *rtw_cfg80211_vendor_event_alloc(
 {
 	struct sk_buff *skb;
 
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 1, 0))
-	skb = cfg80211_vendor_event_alloc(wiphy, len, event_id, gfp);
-#else
 	skb = cfg80211_vendor_event_alloc(wiphy, wdev, len, event_id, gfp);
-#endif
+
 	return skb;
 }