linux-kernel - Re: DRM_CONTROL node breakage (Re: [PATCH] [RFC] drm: Nerf DRM

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Date:   Tue, 21 Feb 2017 00:34:59 -0500 (EST)
From:   David Airlie <airlied@...hat.com>
To:     Thomas Hellstrom <thomas@...pmail.org>
Cc:     Daniel Vetter <daniel.vetter@...ll.ch>,
        Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: DRM_CONTROL node breakage (Re: [PATCH] [RFC] drm: Nerf
 DRM_CONTROL nodes)


> 
> No.
> 
> IMO Not fixing this immediately through stable is out of the question.
> The deal is that we don't break userspace.
> Having said that, I'm not against a long term vmwgfx-only solution. But
> let's fix this now.
> 
> Admittedly we missed testing this but you got to understand that not all
> developer teams have a multitude of
> developers (we have on average one for the whole linux graphics driver
> stack except GL), and the bug
> doesn't show up for QE on regression testing unless they run
> gnome-sheel/Wayland which they currently don't, and I guess they've been
> focused on the fb2 regression.
> 
> It's no secret that we've been using the control nodes for some time.
> The CONTROL_ALLOW is present in the
> driver private ioctls and the commit has been there since 2016.
> 
> The user-space code has been present in vmware-tools also since that
> commit and due to the long release cycles of
> open-vm-tools the open-vm-tools version was just about to be released.
> It's necessary for non-xorg

can you send a revert against drm-next? I'm not sure how clean it will be.

there might be an intermediate step.

Then can we port vmtools of this behaviour, not even sure what it is doing.

Dave.