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

Do not access the object after releasing a reference
It many not be there anymore
Terrible things can happen