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;
diff --git a/os_dep/linux/rtw_proc.c b/os_dep/linux/rtw_proc.c
index 74c4e19..eb3d8ce 100644
--- a/os_dep/linux/rtw_proc.c
+++ b/os_dep/linux/rtw_proc.c
@@ -68,8 +68,14 @@ inline struct proc_dir_entry *rtw_proc_create_dir(const char *name, struct proc_
 	return entry;
 }
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
+#define struct_proc_ops proc_ops
+#else
+#define struct_proc_ops file_operations
+#endif
+
 inline struct proc_dir_entry *rtw_proc_create_entry(const char *name, struct proc_dir_entry *parent,
-	const struct file_operations *fops, void * data)
+	const struct struct_proc_ops *fops, void * data)
 {
 	struct proc_dir_entry *entry;
 
@@ -219,6 +225,15 @@ static ssize_t rtw_drv_proc_write(struct file *file, const char __user *buffer,
 	return -EROFS;
 }
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
+static const struct proc_ops rtw_drv_proc_seq_fops = {
+	.proc_open = rtw_drv_proc_open,
+	.proc_read = seq_read,
+	.proc_lseek = seq_lseek,
+	.proc_release = seq_release,
+	.proc_write = rtw_drv_proc_write,
+};
+#else
 static const struct file_operations rtw_drv_proc_seq_fops = {
 	.owner = THIS_MODULE,
 	.open = rtw_drv_proc_open,
@@ -227,7 +242,17 @@ static const struct file_operations rtw_drv_proc_seq_fops = {
 	.release = seq_release,
 	.write = rtw_drv_proc_write,
 };
+#endif
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
+static const struct proc_ops rtw_drv_proc_sseq_fops = {
+	.proc_open = rtw_drv_proc_open,
+	.proc_read = seq_read,
+	.proc_lseek = seq_lseek,
+	.proc_release = single_release,
+	.proc_write = rtw_drv_proc_write,
+};
+#else
 static const struct file_operations rtw_drv_proc_sseq_fops = {
 	.owner = THIS_MODULE,
 	.open = rtw_drv_proc_open,
@@ -236,6 +261,7 @@ static const struct file_operations rtw_drv_proc_sseq_fops = {
 	.release = single_release,
 	.write = rtw_drv_proc_write,
 };
+#endif
 
 int rtw_drv_proc_init(void)
 {
@@ -2325,6 +2351,15 @@ static ssize_t rtw_adapter_proc_write(struct file *file, const char __user *buff
 	return -EROFS;
 }
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
+static const struct proc_ops rtw_adapter_proc_seq_fops = {
+	.proc_open = rtw_adapter_proc_open,
+	.proc_read = seq_read,
+	.proc_lseek = seq_lseek,
+	.proc_release = seq_release,
+	.proc_write = rtw_adapter_proc_write,
+};
+#else
 static const struct file_operations rtw_adapter_proc_seq_fops = {
 	.owner = THIS_MODULE,
 	.open = rtw_adapter_proc_open,
@@ -2333,7 +2368,17 @@ static const struct file_operations rtw_adapter_proc_seq_fops = {
 	.release = seq_release,
 	.write = rtw_adapter_proc_write,
 };
+#endif
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
+static const struct proc_ops rtw_adapter_proc_sseq_fops = {
+	.proc_open = rtw_adapter_proc_open,
+	.proc_read = seq_read,
+	.proc_lseek = seq_lseek,
+	.proc_release = single_release,
+	.proc_write = rtw_adapter_proc_write,
+};
+#else
 static const struct file_operations rtw_adapter_proc_sseq_fops = {
 	.owner = THIS_MODULE,
 	.open = rtw_adapter_proc_open,
@@ -2342,6 +2387,7 @@ static const struct file_operations rtw_adapter_proc_sseq_fops = {
 	.release = single_release,
 	.write = rtw_adapter_proc_write,
 };
+#endif
 
 int proc_get_odm_dbg_comp(struct seq_file *m, void *v)
 {
@@ -2660,6 +2706,15 @@ static ssize_t rtw_odm_proc_write(struct file *file, const char __user *buffer,
 	return -EROFS;
 }
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
+static const struct proc_ops rtw_odm_proc_seq_fops = {
+	.proc_open = rtw_odm_proc_open,
+	.proc_read = seq_read,
+	.proc_lseek = seq_lseek,
+	.proc_release = seq_release,
+	.proc_write = rtw_odm_proc_write,
+};
+#else
 static const struct file_operations rtw_odm_proc_seq_fops = {
 	.owner = THIS_MODULE,
 	.open = rtw_odm_proc_open,
@@ -2668,7 +2723,17 @@ static const struct file_operations rtw_odm_proc_seq_fops = {
 	.release = seq_release,
 	.write = rtw_odm_proc_write,
 };
+#endif
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
+static const struct proc_ops rtw_odm_proc_sseq_fops = {
+	.proc_open = rtw_odm_proc_open,
+	.proc_read = seq_read,
+	.proc_lseek = seq_lseek,
+	.proc_release = single_release,
+	.proc_write = rtw_odm_proc_write,
+};
+#else
 static const struct file_operations rtw_odm_proc_sseq_fops = {
 	.owner = THIS_MODULE,
 	.open = rtw_odm_proc_open,
@@ -2677,6 +2742,7 @@ static const struct file_operations rtw_odm_proc_sseq_fops = {
 	.release = single_release,
 	.write = rtw_odm_proc_write,
 };
+#endif
 
 struct proc_dir_entry *rtw_odm_proc_init(struct net_device *dev)
 {
@@ -2799,6 +2865,15 @@ static ssize_t rtw_mcc_proc_write(struct file *file, const char __user *buffer,
 	return -EROFS;
 }
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
+static const struct proc_ops rtw_mcc_proc_seq_fops = {
+	.proc_open = rtw_mcc_proc_open,
+	.proc_read = seq_read,
+	.proc_lseek = seq_lseek,
+	.proc_release = seq_release,
+	.proc_write = rtw_mcc_proc_write,
+};
+#else
 static const struct file_operations rtw_mcc_proc_seq_fops = {
 	.owner = THIS_MODULE,
 	.open = rtw_mcc_proc_open,
@@ -2807,7 +2882,17 @@ static const struct file_operations rtw_mcc_proc_seq_fops = {
 	.release = seq_release,
 	.write = rtw_mcc_proc_write,
 };
+#endif
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
+static const struct proc_ops rtw_mcc_proc_sseq_fops = {
+	.proc_open = rtw_mcc_proc_open,
+	.proc_read = seq_read,
+	.proc_lseek = seq_lseek,
+	.proc_release = single_release,
+	.proc_write = rtw_mcc_proc_write,
+};
+#else
 static const struct file_operations rtw_mcc_proc_sseq_fops = {
 	.owner = THIS_MODULE,
 	.open = rtw_mcc_proc_open,
@@ -2816,6 +2901,7 @@ static const struct file_operations rtw_mcc_proc_sseq_fops = {
 	.release = single_release,
 	.write = rtw_mcc_proc_write,
 };
+#endif
 
 struct proc_dir_entry *rtw_mcc_proc_init(struct net_device *dev)
 {