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

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Message-Id: <DDJSBQRQJTMZ.X1W4I5YOURPK@bootlin.com>
Date: Thu, 16 Oct 2025 15:36:00 +0200
From: "Luca Ceresoli" <luca.ceresoli@...tlin.com>
To: "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 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.


> These three patches landed recently,
> $ git log --oneline  next-20251013..next-20251014
> drivers/gpu/drm/display/drm_bridge_connector.c
> 2be300f9a0b6f drm/display: bridge_connector: get/put the stored bridges

^ This is the commit introducing the bug.

Best regards,
Luca

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