return 0;
return -EIO;
queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page){	struct queue_sysfs_entry *entry = to_queue(attr);	struct request_queue *q;	q = container_of(kobj, struct request_queue, kobj);	if (!entry->show)		return 0;	return entry->show(q, page);}