linux-kernel - Re: [PATCH 02/26] drm/bridge: deprecate of_drm_find

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] [day] [month] [year] [list]

Message-Id: <DECRP2E0HI3I.APSIIQR4TVWK@bootlin.com>
Date: Wed, 19 Nov 2025 16:13:41 +0100
From: "Luca Ceresoli" <luca.ceresoli@...tlin.com>
To: "Louis Chauvet" <louis.chauvet@...tlin.com>, "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>, "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>, "Jonathan Corbet"
 <corbet@....net>, "Alexey Brodkin" <abrodkin@...opsys.com>, "Phong LE"
 <ple@...libre.com>, "Liu Ying" <victor.liu@....com>, "Shawn Guo"
 <shawnguo@...nel.org>, "Sascha Hauer" <s.hauer@...gutronix.de>,
 "Pengutronix Kernel Team" <kernel@...gutronix.de>, "Fabio Estevam"
 <festevam@...il.com>, "Adrien Grassein" <adrien.grassein@...il.com>,
 "Laurent Pinchart" <laurent.pinchart+renesas@...asonboard.com>, "Tomi
 Valkeinen" <tomi.valkeinen+renesas@...asonboard.com>, "Kieran Bingham"
 <kieran.bingham+renesas@...asonboard.com>, "Geert Uytterhoeven"
 <geert+renesas@...der.be>, "Magnus Damm" <magnus.damm@...il.com>, "Kevin
 Hilman" <khilman@...libre.com>, "Jerome Brunet" <jbrunet@...libre.com>,
 "Martin Blumenstingl" <martin.blumenstingl@...glemail.com>, "Chun-Kuang Hu"
 <chunkuang.hu@...nel.org>, "Philipp Zabel" <p.zabel@...gutronix.de>,
 "Matthias Brugger" <matthias.bgg@...il.com>, "AngeloGioacchino Del Regno"
 <angelogioacchino.delregno@...labora.com>, "Anitha Chrisanthus"
 <anitha.chrisanthus@...el.com>, "Edmund Dea" <edmund.j.dea@...el.com>,
 "Inki Dae" <inki.dae@...sung.com>, "Seung-Woo Kim"
 <sw0312.kim@...sung.com>, "Kyungmin Park" <kyungmin.park@...sung.com>,
 "Krzysztof Kozlowski" <krzk@...nel.org>, "Alim Akhtar"
 <alim.akhtar@...sung.com>
Cc: "Hui Pu" <Hui.Pu@...ealthcare.com>, "Thomas Petazzoni"
 <thomas.petazzoni@...tlin.com>, <dri-devel@...ts.freedesktop.org>,
 <linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
 <imx@...ts.linux.dev>, <linux-arm-kernel@...ts.infradead.org>,
 <linux-renesas-soc@...r.kernel.org>, <linux-amlogic@...ts.infradead.org>,
 <linux-mediatek@...ts.infradead.org>, <linux-samsung-soc@...r.kernel.org>
Subject: Re: [PATCH 02/26] drm/bridge: deprecate of_drm_find_bridge()

On Wed Nov 19, 2025 at 3:28 PM CET, Louis Chauvet wrote:
>
>
> On 11/19/25 13:05, Luca Ceresoli wrote:
>> of_drm_find_bridge() does not increment the returned bridge
>> refcount. drm_of_find_bridge() is to be used as a replacement.
>>
>> Suggested-by: Maxime Ripard <mripard@...nel.org>
>> Link: https://lore.kernel.org/dri-devel/20250319-stylish-lime-mongoose-0a18ad@houat/
>> Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>

...

>> @@ -1452,6 +1452,9 @@ EXPORT_SYMBOL(drm_of_find_bridge);
>>    *
>>    * @np: device node
>>    *
>> + * This function is deprecated. Use drm_of_find_bridge() instead for proper
>> + * refcounting.
>> + *
>
> I think it should be more explicit that the refcounting is not done by
> this function, like:
>
> 	This function is deprecated. The returned bridge is not refcounted, you
> should not use drm_bridge_put(). Use drm_of_find_bridge() instead for
> proper refcounting.

OK.

--
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com