If you have some sort of state that needs to get created on first open and then removed on last close [...] I would still depend on the cdevpriv destructor and use a reference count between open() and the destructor to know when to cleanup shared state.
Yes, this is what I am doing. I am maintaining a list of all file descriptors open on the device. Once the length of that list reaches zero, I do global clean-up in the cdevpriv destructor.
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