--- y/drivers/usb/core/devio.c
+++ x/drivers/usb/core/devio.c
@@ -2352,7 +2352,7 @@ static int proc_ioctl(struct usb_dev_sta
 
 	/* let kernel drivers try to (re)bind to the interface */
 	case USBDEVFS_CONNECT:
-		if (!intf->dev.driver)
+		if (!intf->dev.driver && intf->dev.p)
 			retval = device_attach(&intf->dev);
 		else
 			retval = -EBUSY;