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

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Message-ID: <4196825.8hzESeGDPO@phil>
Date:   Fri, 24 Jun 2022 09:23:24 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     Brian Norris <briannorris@...omium.org>,
        Doug Anderson <dianders@...omium.org>
Cc:     Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...ux.ie>,
        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()

Am Freitag, 24. Juni 2022, 01:44:52 CEST schrieb Doug Anderson:
> 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.

I do tend to batch up drm-misc patches, as that is always a different
workflow but I'll pick that up :-)

The interesting question would be, do we want some fixes tag for it?


Heiko