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

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Message-Id: <DFW11G0SNME0.3G28YPXH64DOT@kernel.org>
Date: Fri, 23 Jan 2026 15:09:39 +0100
From: "Danilo Krummrich" <dakr@...nel.org>
To: "Jon Hunter" <jonathanh@...dia.com>
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 Fri Jan 23, 2026 at 2:57 PM CET, Jon Hunter wrote:
> 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.
>
> [0] https://lore.kernel.org/linux-tegra/aXJWRUhAe8F67-zG@gmail.com/T/#t

So, are you saying the problems you are seeing are unrelated to this patch and
there is no deadlock? (At least this would explain why we couldn't get a lockdep
splat with the diff I shared. :)

Otherwise, can you please share the output of the commands I shared in my
pevious mail?