[PATCH v12 01/10] i915: only initialize struct ref_tracker_dir once

[Krzysztof Karas]

Hi Jeff,

> I got some warnings from the i915 CI with the ref_tracker debugfs
> patches applied, that indicated that these ref_tracker_dir_init() calls
> were being called more than once. If references were held on these
> objects between the initializations, then that could lead to leaked ref
> tracking objects.
> 
> Since these objects are zalloc'ed, ensure that they are only initialized
> once by testing whether the first byte of the name field is 0.

Are you referring to these warnings?
<3> [314.043410] debugfs: File 'intel_wakeref at ffff88815111a308' in directory 'ref_tracker' already present!
<4> [314.043427] ref_tracker: ref_tracker: unable to create debugfs file for intel_wakeref at ffff88815111a308: -EEXIST

I think those might be caused by introduction of:
"ref_tracker: automatically register a file in debugfs for a ref_tracker_dir".

Current version of "ref_tracker: add a static classname string
to each ref_tracker_dir" further in this series should prevent
multiple calls to "ref_tracker_dir_init()", so this patch could
be dropped I think.
If my reasoning is wrong however, then please add a note to the
commit message which explains why this is needed in more detail
or/and move this patch right before it is necessary. Otherwise
it looks like a vague workaround.

Best Regards,
Krzysztof