Re: [PATCH v3 0/4] drm/panel: refcounting panel lookups and references

Neil Armstrong <[email protected]> Mon, 20 Jul 2026 15:09:38 +0200

Newsgroups	org.kernel.vger.linux-mips,dev.linux.lists.imx,dev.linux.lists.linux-sunxi,org.freedesktop.lists.dri-devel,org.infradead.lists.linux-rockchip,org.kernel.vger.linux-kernel,org.kernel.vger.linux-renesas-soc,org.kernel.vger.linux-samsung-soc,org.kernel.vger.linux-tegra
Message-ID	<178455228150.789946.15332957012612566281.b4-ty@b4>

Hi,

On Fri, 17 Jul 2026 16:02:03 +0200, Albert Esteve wrote:
> The drm_panel subsystem provides kref-based reference counting [1]
> (drm_panel_get/put) but almost nothing in the tree actually uses it.
> This results in a systemic use-after-free pattern throughout the codebase.
> 
> This series aims to close all those issues.
> 
> Patches 1-2: fix the infrastructure. drm_panel_add/remove now keep
> a counted reference for the list entry. drm_panel_bridge_add_typed()
> now holds a counted reference for the lifetime of the panel_bridge.
> 
> [...]

Thanks, Applied to https://gitlab.freedesktop.org/drm/misc/kernel.git (drm-misc-next)

[1/4] drm/panel: have drm_panel_add/remove manage a list reference
      https://gitlab.freedesktop.org/drm/misc/kernel/-/commit/b619d9d2af33db01ea237e3546e9d55595e94ea0
[2/4] drm/bridge/panel: hold a reference to the wrapped panel
      https://gitlab.freedesktop.org/drm/misc/kernel/-/commit/34069e04d338a333561b64a2da055bd16bfba39b
[3/4] drm/panel: of_drm_find_panel() return a counted reference
      https://gitlab.freedesktop.org/drm/misc/kernel/-/commit/738ff709f7cf82a41cbd9f6b8f9b1f236ce26610
[4/4] drm/panel: find_panel_by_fwnode() return a counted reference
      https://gitlab.freedesktop.org/drm/misc/kernel/-/commit/d857b8ce04a7ed4b36a11db16968ab1652ed702a

-- 
Neil