return -EINVAL;
return -EIO;
queue_attr_store(struct kobject *kobj, struct attribute *attr,		    const char *page, size_t length){	struct queue_sysfs_entry *entry = to_queue(attr);	struct request_queue *q;	q = container_of(kobj, struct request_queue, kobj);	if (!entry->store)		return -EINVAL;	return entry->store(q, page, length);}