[PATCH] drm/atomic-helpers: remove legacy_cursor_update hacks

[Maxime Ripard]

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 at cerno.tech>

Maxime
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