ssize_t ret = 0;
ssize_t ret = -EIO;
subsys_attr_show(struct kobject * kobj, struct attribute * attr, char * page){	struct subsystem * s = to_subsys(kobj);	struct subsys_attribute * sattr = to_sattr(attr);	ssize_t ret = 0;	if (sattr->show)		ret = sattr->show(s,page);	return ret;}