/* Unregister function support of a USB device function. 
Must be invoked when USB device is stopped.  */
void usbdc_unregister_function(struct usbdf_driver *func)
/* Unregister function support of a USB device function. 
Must be invoked when USB device is stopped.  */
void usbdc_unregister_function(struct usbdf_driver *func)
{
	list_delete_element(&usbdc.func_list, func);
}