amdgpu dropping load callback triggers WARN_ON in __drm_mode_object_add

[Daniel Vetter]

On Fri, Apr 3, 2020 at 6:30 PM Michel Dänzer <michel at daenzer.net> wrote:
>
>
> I'm getting the attached WARNING splats since amdgpu dropped its load
> callback. They're from
>
>         WARN_ON(!dev->driver->load && dev->registered && !obj_free_cb);
>
> in __drm_mode_object_add.
>
> I'm not sure how to address this, since obj_free_cb is always NULL here,
> and I don't think MST connectors getting added after dev->registered is
> set can be avoided?

I need the full splat, otherwise can't tell you what's going wrong.
There's 2 cases:

- hotpluggable stuff, which has the obj_free_cb set. Essentially MST connectors.

- not-hotpluggable stuff, which is everything else. They don't have
obj_free_cb set. It's a driver bug to register those after the overall
drm_device has already been registered and published to userspace.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch