[PATCH 10/17] nvme: switch controller refcounting to use struct device

[Sagi Grimberg]

>>> By the time we call ->delete_ctrl in nvmf_create_ctrl we must still
>>> have that reference because we are still in a ->write call and thus
>>> ->release can't have been called yet.
>>
>> Thanks for the clarification. Is it worth a preparatory patch to
>> change that before the ctrl device integration for change log
>> clarity?
> 
> Well, the ctrl device integration is what enables us to do this.
> Before that the ctrl refcount could have reached null by the time
> we call the delete_ctrl method.

OK, maybe a change log mention then?