linux-kernel - Re: [PATCH] drm: Fix render node numbering regression from control node removal.

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Date:   Sat, 12 May 2018 21:45:41 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Eric Anholt <eric@...olt.net>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Sean Paul <seanpaul@...omium.org>
Subject: Re: [PATCH] drm: Fix render node numbering regression from control
 node removal.

On Tue, May 08, 2018 at 05:14:25PM -0700, Eric Anholt wrote:
> drm_minor_alloc() does multiplication on this enum, so the removal
> ended up moving render nodes down from 128 base to 64.  This caused
> Mesa's surfaceless backend to be unable to open the render nodes,
> since it was still looking up at 128.
> 
> Signed-off-by: Eric Anholt <eric@...olt.net>
> Fixes: 0d49f303e8a7 ("drm: remove all control node code")
> Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> Cc: Sean Paul <seanpaul@...omium.org>

Oops.

> ---
>  include/drm/drm_file.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/include/drm/drm_file.h b/include/drm/drm_file.h
> index 99ab50cbab00..69b0a8b57502 100644
> --- a/include/drm/drm_file.h
> +++ b/include/drm/drm_file.h
> @@ -49,6 +49,7 @@ struct device;
>  
>  enum drm_minor_type {
>  	DRM_MINOR_PRIMARY,
> +	DRM_MINOR_CONTROL,

Maybe add a comment here why we need this? Either way:

Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>

>  	DRM_MINOR_RENDER,
>  };
>  
> -- 
> 2.17.0
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch