char *driver_name = "";
const char *driver_name = "";
static char *usb_dump_interface_descriptor(char *start, char *end,	const struct usb_interface_cache *intfc,	const struct usb_interface *iface,	int setno){	const struct usb_interface_descriptor *desc = &intfc->altsetting[setno].desc;	char *driver_name = "";	if (start > end)		return start;	down_read(&usb_bus_type.subsys.rwsem);	if (iface)		driver_name = (iface->dev.driver				? iface->dev.driver->name				: "(none)");	start += sprintf(start, format_iface,			 desc->bInterfaceNumber,			 desc->bAlternateSetting,			 desc->bNumEndpoints,			 desc->bInterfaceClass,			 class_decode(desc->bInterfaceClass),			 desc->bInterfaceSubClass,			 desc->bInterfaceProtocol,			 driver_name);	up_read(&usb_bus_type.subsys.rwsem);	return start;}