Hi, all I checked many usb drivers in the mainline kernel which do not record this reference in their probe methods. But according to the documents about this function, we shoud record this reference in our probe methods, just as the call to 'usb_get_dev()' to reference a usb device. Are these usb drivers right or we need to fix them? -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html