linux-kernel - Re: [PATCH v1] mod_devicetable: Bump auxiliary_device

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Message-ID: <aQhk-lQSDhzRmqHu@smile.fi.intel.com>
Date: Mon, 3 Nov 2025 10:16:58 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Greg KH <gregkh@...uxfoundation.org>
Cc: Raag Jadav <raag.jadav@...el.com>, kees@...nel.org, broonie@...nel.org,
	arnd@...db.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] mod_devicetable: Bump auxiliary_device_id name size

On Sat, Nov 01, 2025 at 07:18:22AM +0100, Greg KH wrote:
> On Sat, Nov 01, 2025 at 12:32:34AM +0530, Raag Jadav wrote:
> > Since auxiliary device id string is formed using the combination of parent
> > and child device names, it may require more than 32 bytes if both the names
> > are long enough. Bump the size to 40 bytes to satisfy such cases.
> 
> What in-kernel users need such a larger name?  If we allow larger names,
> people will try to do crazy things and use memory addresses in them (has
> happened already...)
> 
> > Suggested-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > Signed-off-by: Raag Jadav <raag.jadav@...el.com>
> > ---
> > Triggered by [1].
> > 
> > [1] https://lore.kernel.org/r/aQSwWLVKH_3TthTW@smile.fi.intel.com
> 
> How long would this driver submission's name be?  I couldn't figure it
> out, and really, any device with a huge name is going to be a pain...

Right, Raag, please describe a use case.

-- 
With Best Regards,
Andy Shevchenko