group_confdev
put_device(group_confdev(idxd->groups[i]));
conf_dev = group_confdev(group);
put_device(group_confdev(group));
rc = device_add(group_confdev(group));
put_device(group_confdev(group));
device_unregister(group_confdev(group));
device_unregister(group_confdev(group));