--- a/src/USB/driver_fw/drivers/aic8800/aic8800_fdrv/rwnx_main.c
+++ b/src/USB/driver_fw/drivers/aic8800/aic8800_fdrv/rwnx_main.c
@@ -3194,7 +3194,7 @@ 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));
@@ -3649,7 +3649,7 @@ 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);
@@ -5795,6 +5795,7 @@ 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:
@@ -6456,6 +6457,7 @@ 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/USB/driver_fw/drivers/aic8800/aic8800_fdrv/rwnx_msg_tx.c
+++ b/src/USB/driver_fw/drivers/aic8800/aic8800_fdrv/rwnx_msg_tx.c
@@ -614,7 +614,7 @@ int rwnx_send_add_if(struct rwnx_hw *rwn
     //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;
@@ -627,7 +627,7 @@ int rwnx_send_add_if(struct rwnx_hw *rwn
     #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/USB/driver_fw/drivers/aic8800/aic8800_fdrv/rwnx_tdls.c
+++ b/src/USB/driver_fw/drivers/aic8800/aic8800_fdrv/rwnx_tdls.c
@@ -261,17 +261,24 @@ 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/USB/driver_fw/drivers/aic8800/aic8800_fdrv/rwnx_tx.c
+++ b/src/USB/driver_fw/drivers/aic8800/aic8800_fdrv/rwnx_tx.c
@@ -328,6 +328,7 @@ 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/USB/driver_fw/drivers/aic8800/aic8800_fdrv/rwnx_txq.c
+++ b/src/USB/driver_fw/drivers/aic8800/aic8800_fdrv/rwnx_txq.c
@@ -638,6 +638,7 @@ void rwnx_txq_vif_for_each_sta(struct rw
     }
     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: