linux-kernel - Re: [PATCH v5] driver core: enforce device_lock for driver_match

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Message-ID: <2b7109c2-2275-4a38-a52f-f4f901a6d182@nvidia.com>
Date: Fri, 23 Jan 2026 13:57:34 +0000
From: Jon Hunter <jonathanh@...dia.com>
To: Danilo Krummrich <dakr@...nel.org>
Cc: Gui-Dong Han <hanguidong02@...il.com>,
 Marek Szyprowski <m.szyprowski@...sung.com>, Mark Brown
 <broonie@...nel.org>, gregkh@...uxfoundation.org, rafael@...nel.org,
 linux-kernel@...r.kernel.org, baijiaju1990@...il.com,
 Qiu-ji Chen <chenqiuji666@...il.com>, Aishwarya.TCV@....com,
 "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v5] driver core: enforce device_lock for
 driver_match_device()


On 22/01/2026 19:35, Danilo Krummrich wrote:
> On Thu Jan 22, 2026 at 7:58 PM CET, Jon Hunter wrote:
>> On 22/01/2026 18:12, Danilo Krummrich wrote:
>>> With this diff, if I intentionally create a deadlock condition on my machine, I
>>> do see a lockdep splat as expected.
>>>
>>> Anyways, another option would be to attach a hardware debugger (I assume you
>>> have TRACE32 or something available?) and then get a backtrace from the CPU
>>> affected of the deadlock.
>>
>> Unfortunately, these days I don't have such tools available so that's
>> not an option.
> 
> Hm..slowly running out of options. :)

No worries. There appears to be a couple issues going on with this 
board. With the patch reverted the board boots fine and tests pass. Even 
in the passing case with this patch reverted, during boot I see a NULL 
pointer deference crash log from the QSPI driver. So I disabled the QSPI 
device in device-tree and with this patch the board boots fine and tests 
pass.

There is a on-going thread for the QSPI driver to fix these NULL pointer 
deference crashes [0]. So the QSPI driver seems to be the root of the 
problem.

Cheers
Jon

[0] https://lore.kernel.org/linux-tegra/aXJWRUhAe8F67-zG@gmail.com/T/#t

-- 
nvpublic