linux-kernel - Re: [PATCH] drm/atomic-helpers: remove legacy_cursor

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Date:   Tue, 7 Mar 2023 15:56:13 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Daniel Vetter <daniel.vetter@...ll.ch>
Cc:     DRI Development <dri-devel@...ts.freedesktop.org>,
        Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Thomas Zimmermann <tzimmermann@...e.de>, mikita.lipski@....com,
        Michel Dänzer <michel@...nzer.net>,
        harry.wentland@....com, Rob Clark <robdclark@...il.com>,
        "Kazlauskas, Nicholas" <nicholas.kazlauskas@....com>,
        Dmitry Osipenko <dmitry.osipenko@...labora.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Jani Nikula <jani.nikula@...el.com>,
        Lucas De Marchi <lucas.demarchi@...el.com>,
        Imre Deak <imre.deak@...el.com>,
        Manasi Navare <manasi.d.navare@...el.com>,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Daniel Vetter <daniel.vetter@...el.com>
Subject: Re: [PATCH] drm/atomic-helpers: remove legacy_cursor_update hacks

Hi,

On Thu, Feb 16, 2023 at 12:12:13PM +0100, Daniel Vetter wrote:
> The stuff never really worked, and leads to lots of fun because it
> out-of-order frees atomic states. Which upsets KASAN, among other
> things.
> 
> For async updates we now have a more solid solution with the
> ->atomic_async_check and ->atomic_async_commit hooks. Support for that
> for msm and vc4 landed. nouveau and i915 have their own commit
> routines, doing something similar.
> 
> For everyone else it's probably better to remove the use-after-free
> bug, and encourage folks to use the async support instead. The
> affected drivers which register a legacy cursor plane and don't either
> use the new async stuff or their own commit routine are: amdgpu,
> atmel, mediatek, qxl, rockchip, sti, sun4i, tegra, virtio, and vmwgfx.
> 
> Inspired by an amdgpu bug report.

Thanks for submitting that patch. It's been in the downstream RPi tree
for a while, so I'd really like it to be merged eventually :)

Acked-by: Maxime Ripard <maxime@...no.tech>

Maxime

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