linux-kernel - Re: next-20251014: Internal error: Oops: drm_bridge_connector_hdmi_cec_init drmm_connector_hdmi_cec

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Message-Id: <DDKQH2MIHZ2S.2MPJCNHXMIT4U@bootlin.com>
Date: Fri, 17 Oct 2025 18:21:35 +0200
From: "Luca Ceresoli" <luca.ceresoli@...tlin.com>
To: "Luca Ceresoli" <luca.ceresoli@...tlin.com>, "Naresh Kamboju"
 <naresh.kamboju@...aro.org>, <dri-devel@...ts.freedesktop.org>, "open list"
 <linux-kernel@...r.kernel.org>, <lkft-triage@...ts.linaro.org>, "Linux
 Regressions" <regressions@...ts.linux.dev>
Cc: "Dmitry Baryshkov" <dmitry.baryshkov@....qualcomm.com>, "Simona Vetter"
 <simona@...ll.ch>, "David Airlie" <airlied@...il.com>, "Maxime Ripard"
 <mripard@...nel.org>, "Arnd Bergmann" <arnd@...db.de>, "Dan Carpenter"
 <dan.carpenter@...aro.org>, "Anders Roxell" <anders.roxell@...aro.org>,
 "Ben Copeland" <benjamin.copeland@...aro.org>
Subject: Re: next-20251014: Internal error: Oops:
 drm_bridge_connector_hdmi_cec_init drmm_connector_hdmi_cec_register

Hello,

On Thu Oct 16, 2025 at 3:36 PM CEST, Luca Ceresoli wrote:
> Hello Naresh,
>
> On Thu Oct 16, 2025 at 12:52 PM CEST, Naresh Kamboju wrote:
>> On Thu, 16 Oct 2025 at 16:14, Naresh Kamboju <naresh.kamboju@...aro.org> wrote:
>>>
>>> While booting and loading kernel modules on dragonboard 410c board
>>> with Linux next
>>> kernel next-20251014 and next-20251015 the following crash noticed,
>>>
>>> First seen on next-20251014
>>> Good: next-20251013
>>> Bad:  next-20251014
>>>
>>> Regression Analysis:
>>> - New regression? yes
>>> - Reproducibility? yes
>>>
>>> Boot regressions: next-20251014: Internal error: Oops:
>>> drm_bridge_connector_hdmi_cec_init drmm_connector_hdmi_cec_register
>
> Thanks for the report.
>
> This looks like the same issue reported here:
> https://lore.kernel.org/all/336fbfdd-c424-490e-b5d1-8ee84043dc80@samsung.com/
>
> I'm writing a fix right now, will send it today if all goes well.

Here's the fixed version:
https://lore.kernel.org/lkml/20251017-drm-bridge-alloc-getput-bridge-connector-fix-hdmi_cec-v2-0-667abf6d47c0@bootlin.com/

Luca

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