samples: net: Do not setup VLAN if there is no VLAN interfaces

No point trying to initialize VLAN interfaces if the VLAN
interface count is zero.

Signed-off-by: Jukka Rissanen <[email protected]>

Author: jukkar

samples/net/mdns_responder/src/vlan.c

@@ -105,6 +105,11 @@ int init_vlan(void)
 	struct ud user_data;
 	int ret;
 
+	if (CONFIG_NET_VLAN_COUNT == 0) {
+		LOG_DBG("No VLAN interfaces defined.");
+		return 0;
+	}
+
 	iface = net_if_get_first_by_type(&NET_L2_GET_NAME(ETHERNET));
 	if (!iface) {
 		LOG_ERR("No ethernet interfaces found.");

samples/net/sockets/echo_client/src/vlan.c

@@ -85,6 +85,11 @@ int init_vlan(void)
 	struct ud ud;
 	int ret;
 
+	if (CONFIG_NET_VLAN_COUNT == 0) {
+		LOG_DBG("No VLAN interfaces defined.");
+		return 0;
+	}
+
 	iface = net_if_get_first_by_type(&NET_L2_GET_NAME(ETHERNET));
 	if (!iface) {
 		LOG_ERR("No ethernet interfaces found.");

samples/net/sockets/echo_server/src/vlan.c

@@ -107,6 +107,11 @@ int init_vlan(void)
 	struct ud ud;
 	int ret;
 
+	if (CONFIG_NET_VLAN_COUNT == 0) {
+		LOG_DBG("No VLAN interfaces defined.");
+		return 0;
+	}
+
 	memset(&ud, 0, sizeof(ud));
 
 	net_if_foreach(iface_cb, &ud);

samples/net/sockets/txtime/src/vlan.c

@@ -99,6 +99,11 @@ int init_vlan(void)
 	struct ud ud;
 	int ret;
 
+	if (CONFIG_NET_VLAN_COUNT == 0) {
+		LOG_DBG("No VLAN interfaces defined.");
+		return 0;
+	}
+
 	iface = net_if_get_first_by_type(&NET_L2_GET_NAME(ETHERNET));
 	if (!iface) {
 		LOG_ERR("No ethernet interfaces found.");