diff --git a/core/rtw_mlme_ext.c b/core/rtw_mlme_ext.c
index bd7a8db..3549f11 100644
--- a/core/rtw_mlme_ext.c
+++ b/core/rtw_mlme_ext.c
@@ -1465,7 +1465,7 @@ void mgt_dispatcher(_adapter *padapter, union recv_frame *precv_frame)
 			ptable->func = &OnAuth;
 		else
 			ptable->func = &OnAuthClient;
-	/* pass through */
+		__attribute__ ((__fallthrough__));/* FALL THRU */
 	case WIFI_ASSOCREQ:
 	case WIFI_REASSOCREQ:
 		_mgt_dispatcher(padapter, ptable, precv_frame);
diff --git a/hal/btc/halbtc8723d1ant.c b/hal/btc/halbtc8723d1ant.c
index df0f4e9..bcbdaee 100644
--- a/hal/btc/halbtc8723d1ant.c
+++ b/hal/btc/halbtc8723d1ant.c
@@ -3576,6 +3576,7 @@ static void halbtc8723d1ant_psd_show_antenna_detect_result(IN struct btc_coexist
 	case 11:
 		CL_SPRINTF(cli_buf, BT_TMP_BUF_SIZE,
 			   "(BT is Disabled)");
+		break;
 	case 12:
 		CL_SPRINTF(cli_buf, BT_TMP_BUF_SIZE,
 			   "(BT is available, result from BT");
diff --git a/hal/btc/halbtc8723d2ant.c b/hal/btc/halbtc8723d2ant.c
index b4d122f..460a091 100644
--- a/hal/btc/halbtc8723d2ant.c
+++ b/hal/btc/halbtc8723d2ant.c
@@ -4160,6 +4160,7 @@ static void halbtc8723d2ant_psd_show_antenna_detect_result(IN struct btc_coexist
 	case 11:
 		CL_SPRINTF(cli_buf, BT_TMP_BUF_SIZE,
 			   "(BT is Disabled)");
+		break;
 	case 12:
 		CL_SPRINTF(cli_buf, BT_TMP_BUF_SIZE,
 			   "(BT is available, result from BT");
diff --git a/hal/hal_intf.c b/hal/hal_intf.c
index bf7a65f..feb1a07 100644
--- a/hal/hal_intf.c
+++ b/hal/hal_intf.c
@@ -811,6 +811,7 @@ s32 c2h_handler(_adapter *adapter, u8 id, u8 seq, u8 plen, u8 *payload)
 
 	case C2H_EXTEND:
 		sub_id = payload[0];
+		__attribute__((__fallthrough__));
 		/* no handle, goto default */
 
 	default:
diff --git a/os_dep/linux/ioctl_cfg80211.c b/os_dep/linux/ioctl_cfg80211.c
index cd1bfe7..564c2c5 100644
--- a/os_dep/linux/ioctl_cfg80211.c
+++ b/os_dep/linux/ioctl_cfg80211.c
@@ -1809,6 +1809,7 @@ static int cfg80211_rtw_change_iface(struct wiphy *wiphy,
 	#if defined(CONFIG_P2P) && ((LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37)) || defined(COMPAT_KERNEL_RELEASE))
 	case NL80211_IFTYPE_P2P_CLIENT:
 		is_p2p = _TRUE;
+        __attribute__((__fallthrough__));
 	#endif
 	case NL80211_IFTYPE_STATION:
 		networkType = Ndis802_11Infrastructure;
@@ -1833,6 +1834,7 @@ static int cfg80211_rtw_change_iface(struct wiphy *wiphy,
 	#if defined(CONFIG_P2P) && ((LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37)) || defined(COMPAT_KERNEL_RELEASE))
 	case NL80211_IFTYPE_P2P_GO:
 		is_p2p = _TRUE;
+        __attribute__((__fallthrough__));
 	#endif
 	case NL80211_IFTYPE_AP:
 		networkType = Ndis802_11APMode;