linux-kernel - [PATCH v3 22/22] drm/todo: add entry to remove devm_drm_put

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250509-drm-bridge-convert-to-alloc-api-v3-22-b8bc1f16d7aa@bootlin.com>
Date: Fri, 09 May 2025 15:53:48 +0200
From: Luca Ceresoli <luca.ceresoli@...tlin.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Andrzej Hajda <andrzej.hajda@...el.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>, 
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>, 
 Jagan Teki <jagan@...rulasolutions.com>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, 
 Douglas Anderson <dianders@...omium.org>, 
 Chun-Kuang Hu <chunkuang.hu@...nel.org>, 
 Krzysztof Kozlowski <krzk@...nel.org>
Cc: Anusha Srivatsa <asrivats@...hat.com>, 
 Paul Kocialkowski <paulk@...-base.io>, Dmitry Baryshkov <lumag@...nel.org>, 
 Hui Pu <Hui.Pu@...ealthcare.com>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 dri-devel@...ts.freedesktop.org, asahi@...ts.linux.dev, 
 linux-kernel@...r.kernel.org, chrome-platform@...ts.linux.dev, 
 imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
 linux-mediatek@...ts.infradead.org, linux-amlogic@...ts.infradead.org, 
 linux-renesas-soc@...r.kernel.org, platform-driver-x86@...r.kernel.org, 
 linux-samsung-soc@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
 freedreno@...ts.freedesktop.org, linux-stm32@...md-mailman.stormreply.com, 
 Luca Ceresoli <luca.ceresoli@...tlin.com>, Jonathan Corbet <corbet@....net>, 
 linux-doc@...r.kernel.org
Subject: [PATCH v3 22/22] drm/todo: add entry to remove
 devm_drm_put_bridge()

devm_drm_put_bridge() is a temporary workaround waiting for the panel
bridge lifetime rework. Add a TODO entry to not forget it must be removed
after such rework.

Suggested-by: Maxime Ripard <mripard@...nel.org>
Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>

---

To: Jonathan Corbet <corbet@....net>
Cc: linux-doc@...r.kernel.org

This patch was added in v3
---
 Documentation/gpu/todo.rst | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst
index c57777a24e03d91b1ffe04365f7356f2d938befd..be8637da3fe950ddcb65cdcf626bc4b4e6b0fa26 100644
--- a/Documentation/gpu/todo.rst
+++ b/Documentation/gpu/todo.rst
@@ -515,6 +515,21 @@ Contact: Douglas Anderson <dianders@...omium.org>
 
 Level: Starter
 
+Remove devm_drm_put_bridge()
+----------------------------
+
+Due to how the panel bridge handles the drm_bridge object lifetime, special
+care must be taken to dispose of the drm_bridge object when the
+panel_bridge is removed. This is currently managed using
+devm_drm_put_bridge(), but that is an unsafe, temporary workaround. To fix
+that, the DRM panel lifetime needs to be reworked. After the rework is
+done, remove devm_drm_put_bridge() and the TODO in
+drm_panel_bridge_remove().
+
+Contact: Maxime Ripard <mripard@...nel.org>,
+         Luca Ceresoli <luca.ceresoli@...tlin.com>
+
+Level: Intermediate
 
 Core refactorings
 =================

-- 
2.49.0