func resourceArmSubnetCreate(d *schema.ResourceData, meta interface{}) error {
	client := meta.(*ArmClient)
	subnetClient := client.subnetClient

	log.Printf("[INFO] preparing arguments for Azure ARM Subnet creation.")

	name := d.Get("name").(string)
	vnetName := d.Get("virtual_network_name").(string)
	resGroup := d.Get("resource_group_name").(string)
	addressPrefix := d.Get("address_prefix").(string)

	armMutexKV.Lock(vnetName)
	defer armMutexKV.Unlock(vnetName)

	properties := network.SubnetPropertiesFormat{
		AddressPrefix: &addressPrefix,
	}

	if v, ok := d.GetOk("network_security_group_id"); ok {
		nsgId := v.(string)
		properties.NetworkSecurityGroup = &network.SecurityGroup{
			ID: &nsgId,
		}
	}

	if v, ok := d.GetOk("route_table_id"); ok {
		rtId := v.(string)
		properties.RouteTable = &network.RouteTable{
			ID: &rtId,
		}
	}

	subnet := network.Subnet{
		Name:       &name,
		Properties: &properties,
	}

	resp, err := subnetClient.CreateOrUpdate(resGroup, vnetName, name, subnet)
	if err != nil {
		return err
	}

	d.SetId(*resp.ID)

	log.Printf("[DEBUG] Waiting for Subnet (%s) to become available", name)
	stateConf := &resource.StateChangeConf{
		Pending: []string{"Accepted", "Updating"},
		Target:  "Succeeded",
		Refresh: subnetRuleStateRefreshFunc(client, resGroup, vnetName, name),
		Timeout: 10 * time.Minute,
	}
	if _, err := stateConf.WaitForState(); err != nil {
		return fmt.Errorf("Error waiting for Subnet (%s) to become available: %s", name, err)
	}

	return resourceArmSubnetRead(d, meta)
}
func resourceArmSubnetCreate(d *schema.ResourceData, meta interface{}) error {
	client := meta.(*ArmClient)
	subnetClient := client.subnetClient

	log.Printf("[INFO] preparing arguments for Azure ARM Subnet creation.")

	name := d.Get("name").(string)
	vnetName := d.Get("virtual_network_name").(string)
	resGroup := d.Get("resource_group_name").(string)
	addressPrefix := d.Get("address_prefix").(string)

	armMutexKV.Lock(vnetName)
	defer armMutexKV.Unlock(vnetName)

	properties := network.SubnetPropertiesFormat{
		AddressPrefix: &addressPrefix,
	}

	if v, ok := d.GetOk("network_security_group_id"); ok {
		nsgId := v.(string)
		properties.NetworkSecurityGroup = &network.SecurityGroup{
			ID: &nsgId,
		}
	}

	if v, ok := d.GetOk("route_table_id"); ok {
		rtId := v.(string)
		properties.RouteTable = &network.RouteTable{
			ID: &rtId,
		}
	}

	subnet := network.Subnet{
		Name:       &name,
		Properties: &properties,
	}

	_, err := subnetClient.CreateOrUpdate(resGroup, vnetName, name, subnet, make(chan struct{}))
	if err != nil {
		return err
	}

	read, err := subnetClient.Get(resGroup, vnetName, name, "")
	if err != nil {
		return err
	}
	if read.ID == nil {
		return fmt.Errorf("Cannot read Subnet %s/%s (resource group %s) ID", vnetName, name, resGroup)
	}

	d.SetId(*read.ID)

	return resourceArmSubnetRead(d, meta)
}