linux-kernel - Re: [PATCH v3 2/2] iio: adc: ltc2309: add support for ltc2305

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Message-ID: <aXc_XxDxc5PuI7Tu@smile.fi.intel.com>
Date: Mon, 26 Jan 2026 12:18:07 +0200
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: kernel test robot <lkp@...el.com>
Cc: Kyle Hsieh <kylehsieh1995@...il.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Liam Beguin <liambeguin@...il.com>, llvm@...ts.linux.dev,
	oe-kbuild-all@...ts.linux.dev, linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] iio: adc: ltc2309: add support for ltc2305

On Mon, Jan 26, 2026 at 02:22:21PM +0800, kernel test robot wrote:
> Hi Kyle,
> 
> kernel test robot noticed the following build warnings:
> 
> [auto build test WARNING on 9448598b22c50c8a5bb77a9103e2d49f134c9578]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Kyle-Hsieh/dt-bindings-adc-ltc2497-add-support-for-ltc2305/20260126-093339
> base:   9448598b22c50c8a5bb77a9103e2d49f134c9578
> patch link:    https://lore.kernel.org/r/20260126-add_ltc2305_driver-v3-2-951349a87f97%40gmail.com
> patch subject: [PATCH v3 2/2] iio: adc: ltc2309: add support for ltc2305
> config: i386-buildonly-randconfig-006-20260126 (https://download.01.org/0day-ci/archive/20260126/202601261441.M4qQzY72-lkp@intel.com/config)
> compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260126/202601261441.M4qQzY72-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202601261441.M4qQzY72-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 
> >> drivers/iio/adc/ltc2309.c:209:20: warning: variable 'chip_info' is uninitialized when used here [-Wuninitialized]
>      209 |         indio_dev->name = chip_info->name;
>          |                           ^~~~~~~~~
>    drivers/iio/adc/ltc2309.c:195:43: note: initialize the variable 'chip_info' to silence this warning
>      195 |         const struct ltc2309_chip_info *chip_info;
>          |                                                  ^
>          |                                                   = NULL

This is so wrong advice!

>    1 warning generated.

...

The device_get_match_data() call is missing.

-- 
With Best Regards,
Andy Shevchenko