sysfs_remove_file(&bss_hotplug_slot->kobj, &sn_slot_path_attr.attr);
static struct hotplug_slot * sn_hp_destroy(void){	struct slot *slot;	struct list_head *list;	struct hotplug_slot *bss_hotplug_slot = NULL;	list_for_each(list, &sn_hp_list) {		slot = list_entry(list, struct slot, hp_list);		bss_hotplug_slot = slot->hotplug_slot;		list_del(&((struct slot *)bss_hotplug_slot->private)->			 hp_list);		break;	}	return bss_hotplug_slot;}