--- a/src/SDIO/driver_fw/driver/aic8800/aic8800_fdrv/rwnx_main.c
+++ b/src/SDIO/driver_fw/driver/aic8800/aic8800_fdrv/rwnx_main.c
@@ -2932,7 +2932,7 @@ static struct rwnx_vif *rwnx_interface_a
 		vif->ap.generation = 0;
 		vif->ap.mesh_pm = NL80211_MESH_POWER_ACTIVE;
 		vif->ap.next_mesh_pm = NL80211_MESH_POWER_ACTIVE;
-		// no break
+		fallthrough;
 	case NL80211_IFTYPE_AP:
 		INIT_LIST_HEAD(&vif->ap.sta_list);
 		memset(&vif->ap.bcn, 0, sizeof(vif->ap.bcn));
@@ -3349,7 +3349,7 @@ static int rwnx_cfg80211_change_iface(st
 		INIT_LIST_HEAD(&vif->ap.proxy_list);
 		vif->ap.create_path = false;
 		vif->ap.generation = 0;
-		// no break
+		fallthrough;
 	case NL80211_IFTYPE_AP:
 	case NL80211_IFTYPE_P2P_GO:
 		INIT_LIST_HEAD(&vif->ap.sta_list);
@@ -5257,6 +5257,7 @@ static int rwnx_cfg80211_mgmt_tx(struct
 	switch (RWNX_VIF_TYPE(rwnx_vif)) {
 	case NL80211_IFTYPE_AP_VLAN:
 		rwnx_vif = rwnx_vif->ap_vlan.master;
+		fallthrough;
 	case NL80211_IFTYPE_AP:
 	case NL80211_IFTYPE_P2P_GO:
 	case NL80211_IFTYPE_MESH_POINT:
@@ -5569,7 +5570,7 @@ rwnx_cfg80211_tdls_mgmt(struct wiphy *wi
 			printk("%s: only one TDLS link is supported!\n", __func__);
 			status_code = WLAN_STATUS_REQUEST_DECLINED;
 		}
-		/* fall-through */
+		fallthrough;
 	case WLAN_TDLS_SETUP_REQUEST:
 	case WLAN_TDLS_TEARDOWN:
 	case WLAN_TDLS_DISCOVERY_REQUEST:
@@ -5889,6 +5890,7 @@ static int rwnx_fill_station_info(struct
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 19, 0)
 	case FORMATMOD_HE_MU:
 		sinfo->rxrate.he_ru_alloc = rx_vect1->he.ru_size;
+		fallthrough;
 	case FORMATMOD_HE_SU:
 	case FORMATMOD_HE_ER:
 		sinfo->rxrate.flags = RATE_INFO_FLAGS_HE_MCS;
--- a/src/SDIO/driver_fw/driver/aic8800/aic8800_fdrv/rwnx_msg_tx.c
+++ b/src/SDIO/driver_fw/driver/aic8800/aic8800_fdrv/rwnx_msg_tx.c
@@ -524,7 +524,7 @@ int rwnx_send_add_if (struct rwnx_hw *rw
 	//case NL80211_IFTYPE_P2P_DEVICE:
 	case NL80211_IFTYPE_P2P_CLIENT:
 		add_if_req_param->p2p = true;
-		// no break
+		fallthrough;
 	#endif /* CONFIG_RWNX_FULLMAC */
 	case NL80211_IFTYPE_STATION:
 		add_if_req_param->type = MM_STA;
@@ -537,7 +537,7 @@ int rwnx_send_add_if (struct rwnx_hw *rw
 	#ifdef CONFIG_RWNX_FULLMAC
 	case NL80211_IFTYPE_P2P_GO:
 		add_if_req_param->p2p = true;
-		// no break
+		fallthrough;
 	#endif /* CONFIG_RWNX_FULLMAC */
 	case NL80211_IFTYPE_AP:
 		add_if_req_param->type = MM_AP;
--- a/src/SDIO/driver_fw/driver/aic8800/aic8800_fdrv/rwnx_tdls.c
+++ b/src/SDIO/driver_fw/driver/aic8800/aic8800_fdrv/rwnx_tdls.c
@@ -255,17 +255,24 @@ rwnx_add_wmm_info_ie(struct sk_buff *skb
 static u8 rwnx_ac_from_wmm(int ac)
 {
 	switch (ac) {
-	default:
-		WARN_ON_ONCE(1);
 	case 0:
 		return AC_BE;
+		break;
 	case 1:
 		return AC_BK;
+		break;
 	case 2:
 		return AC_VI;
+		break;
 	case 3:
 		return AC_VO;
+		break;
+	default:
+		WARN_ON_ONCE(1);
+		break;
 	}
+
+	return 0;
 }
 
 static void
--- a/src/SDIO/driver_fw/driver/aic8800/aic8800_fdrv/rwnx_tx.c
+++ b/src/SDIO/driver_fw/driver/aic8800/aic8800_fdrv/rwnx_tx.c
@@ -325,6 +325,7 @@ u16 rwnx_select_txq(struct rwnx_vif *rwn
 		/* AP_VLAN interface is not used for a 4A STA,
 		   fallback searching sta amongs all AP's clients */
 		rwnx_vif = rwnx_vif->ap_vlan.master;
+		fallthrough;
 	case NL80211_IFTYPE_AP:
 	case NL80211_IFTYPE_P2P_GO:
 	{
--- a/src/SDIO/driver_fw/driver/aic8800/aic8800_fdrv/rwnx_txq.c
+++ b/src/SDIO/driver_fw/driver/aic8800/aic8800_fdrv/rwnx_txq.c
@@ -635,6 +635,7 @@ static inline void rwnx_txq_vif_for_each
 	}
 	case NL80211_IFTYPE_AP_VLAN:
 		rwnx_vif = rwnx_vif->ap_vlan.master;
+		fallthrough;
 	case NL80211_IFTYPE_AP:
 	case NL80211_IFTYPE_MESH_POINT:
 	case NL80211_IFTYPE_P2P_GO: