[PATCH 3/3] drm/debugfs: remove dev->debugfs_list and debugfs_mutex

[Stanislaw Gruszka]

On Thu, Feb 16, 2023 at 07:06:46PM +0200, Jani Nikula wrote:
> >
> > But should not this the driver responsibility, call drm_debugfs_add_file()
> > whenever you are ready to handle operations on added file ?
> 
> In theory, yes, but in practice it's pretty hard for a non-trivial
> driver to maintain that all the conditions are met.

Hmmm... 

> In i915 we call debugfs register all over the place only after we've
> called drm_dev_register(), because it's the only sane way. But it means
> we need the init and register separated everywhere, instead of init
> adding files to a list to be registered later.

Isn't this done this way in i915 only because it was not possible
(and still isn't) to call drm_debugfs_create_file() before registration ?

I think it's should be ok by i915 subsystem to create it's debugfs
files and allow to access to them just after that subsystem init.

Or there are some complex dependencies between i915 subsystems,
that reading registers from one subsystem will corrupt some
other subsystem that did non finish initialization yet?

Regards
Stanislaw