Reference counting

kobjects start with a reference count of 1
kobject_init()
Creator must release reference eventually

To take or release references:
struct kobject *kobject_get(struct kobject *kobj);
Returns pointer to same kobject
Can fail, check return status
void kobject_put(struct kobject *kobj);
May release object before returning

What happens when refcount goes to zero?
We'll get there shortly

But first:
Doing reference counting right