linux-kernel - Re: [PATCH 4/4] drm/bridge: add warning for bridges attached without being added

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Message-ID: <a822d284-f2a2-40f8-987a-6e2f70a22fcf@gmail.com>
Date: Sat, 18 Oct 2025 14:46:50 +0200
From: Raphaël Gallais-Pou <rgallaispou@...il.com>
To: Luca Ceresoli <luca.ceresoli@...tlin.com>,
 Alain Volmat <alain.volmat@...s.st.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>,
 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>
Cc: Hui Pu <Hui.Pu@...ealthcare.com>,
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] drm/bridge: add warning for bridges attached without
 being added



Le 03/10/2025 à 10:59, Luca Ceresoli a écrit :
> DRM bridges must be added before they are attached. Add a warning to catch
> violations.
> 
> The warning is based on the bridge not being part of any list, so it will
> trigger if the bridge is being attached without ever having been added.
> 
> It won't catch cases of bridges attached after having been added and then
> removed, because in that case the bridge will be in
> bridge_lingering_list. However such a case is both more demanding to detect
> and less likely to happen, so it can be left unchecked, at least for now.
> 
> Link: https://lore.kernel.org/all/20250709-sophisticated-loon-of-rain-6ccdd8@houat/
> Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>
> ---

Reviewed-by: Raphael Gallais-Pou <rgallaispou@...il.com>

Best regards,
Raphaël>