[PATCH 2/6] drm: add tile_group support.

[Dave Airlie]

> Don't you need a kref_get_unless_zero here since we only destroy the idr
> entry after the refcount dropped to zero? Or is there some magic thing
> that prevents this like another mutex (in which case some mutex assert in
> get/put would be good)?

This does all happen under mode_config.mutex but I think I'd rather use
get_unless_zero.


>
> And kerneldoc for the non-exported functions please, preferrably with some
> overview DOC: section to pull it all together.

I'm posting v2, advice on kerneldoc required, so the functions end up
in the right place, I don't really wnat to add a new C file for this.

Dave.