[PATCH] drm/rockchip: vop: Don't crash for invalid duplicate_state()

[Doug Anderson]

Hi,

On Fri, Jun 17, 2022 at 5:27 PM Brian Norris <briannorris at chromium.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 at chromium.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 at chromium.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