linux-kernel - Re: [PATCH] drm/rockchip: vop: Don't crash for invalid duplicate

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Date:   Thu, 23 Jun 2022 16:44:52 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Brian Norris <briannorris@...omium.org>
Cc:     Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...ux.ie>,
        Heiko Stübner <heiko@...ech.de>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Sandy Huang <hjc@...k-chips.com>,
        Sean Paul <seanpaul@...omium.org>
Subject: Re: [PATCH] drm/rockchip: vop: Don't crash for invalid duplicate_state()

Hi,

On Fri, Jun 17, 2022 at 5:27 PM Brian Norris <briannorris@...omium.org> wrote:
>
> It's possible for users to try to duplicate the CRTC state even when the
> state doesn't exist. drm_atomic_helper_crtc_duplicate_state() (and other
> users of __drm_atomic_helper_crtc_duplicate_state()) already guard this
> with a WARN_ON() instead of crashing, so let's do that here too.
>
> Signed-off-by: Brian Norris <briannorris@...omium.org>
> ---
>
>  drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 3 +++
>  1 file changed, 3 insertions(+)

I'm not an expert in this area, but it makes sense to me to match
drm_atomic_helper_crtc_duplicate_state() in this way. Thus:

Reviewed-by: Douglas Anderson <dianders@...omium.org>

I would tend to assume that this would be landed in drm-misc by Heiko
if he's good with it. After several weeks of silence, however, I'll
commit it myself.

-Doug