linux-kernel - Re: [PATCH 10/12] iio: adc: ad9467: convert to backend framework

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Date:   Wed, 22 Nov 2023 08:54:57 +0800
From:   kernel test robot <lkp@...el.com>
To:     Nuno Sa via B4 Relay <devnull+nuno.sa.analog.com@...nel.org>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-iio@...r.kernel.org
Cc:     oe-kbuild-all@...ts.linux.dev,
        Olivier MOYSAN <olivier.moysan@...s.st.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Nuno Sa <nuno.sa@...log.com>
Subject: Re: [PATCH 10/12] iio: adc: ad9467: convert to backend framework

Hi Nuno,

kernel test robot noticed the following build warnings:

[auto build test WARNING on jic23-iio/togreg]
[also build test WARNING on driver-core/driver-core-testing driver-core/driver-core-next driver-core/driver-core-linus robh/for-next linus/master v6.7-rc2 next-20231121]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Nuno-Sa-via-B4-Relay/driver-core-allow-modifying-device_links-flags/20231121-182010
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg
patch link:    https://lore.kernel.org/r/20231121-dev-iio-backend-v1-10-6a3d542eba35%40analog.com
patch subject: [PATCH 10/12] iio: adc: ad9467: convert to backend framework
config: powerpc-randconfig-r071-20231122 (https://download.01.org/0day-ci/archive/20231122/202311220807.NUS4r7ML-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20231122/202311220807.NUS4r7ML-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/202311220807.NUS4r7ML-lkp@intel.com/

smatch warnings:
drivers/iio/adc/ad9467.c:276 ad9467_get_scale() warn: unsigned 'vref_val' is never less than zero.

vim +/vref_val +276 drivers/iio/adc/ad9467.c

ad67971202381c Michael Hennerich  2020-03-24  270  
a78b758afbce92 Nuno Sa            2023-11-21  271  static int ad9467_get_scale(struct ad9467_state *st, int *val, int *val2)
ad67971202381c Michael Hennerich  2020-03-24  272  {
337dbb6ec1acc2 Alexandru Ardelean 2020-09-24  273  	unsigned int i, vref_val;
ad67971202381c Michael Hennerich  2020-03-24  274  
ad67971202381c Michael Hennerich  2020-03-24  275  	vref_val = ad9467_spi_read(st->spi, AN877_ADC_REG_VREF);
d1e957a3e7676f Nuno Sa            2023-11-21 @276  	if (vref_val < 0)
d1e957a3e7676f Nuno Sa            2023-11-21  277  		return vref_val;
ad67971202381c Michael Hennerich  2020-03-24  278  
a78b758afbce92 Nuno Sa            2023-11-21  279  	vref_val &= st->info->vref_mask;
ad67971202381c Michael Hennerich  2020-03-24  280  
a78b758afbce92 Nuno Sa            2023-11-21  281  	for (i = 0; i < st->info->num_scales; i++) {
a78b758afbce92 Nuno Sa            2023-11-21  282  		if (vref_val == st->info->scale_table[i][1])
ad67971202381c Michael Hennerich  2020-03-24  283  			break;
ad67971202381c Michael Hennerich  2020-03-24  284  	}
ad67971202381c Michael Hennerich  2020-03-24  285  
a78b758afbce92 Nuno Sa            2023-11-21  286  	if (i == st->info->num_scales)
ad67971202381c Michael Hennerich  2020-03-24  287  		return -ERANGE;
ad67971202381c Michael Hennerich  2020-03-24  288  
a78b758afbce92 Nuno Sa            2023-11-21  289  	__ad9467_get_scale(st, i, val, val2);
ad67971202381c Michael Hennerich  2020-03-24  290  
ad67971202381c Michael Hennerich  2020-03-24  291  	return IIO_VAL_INT_PLUS_MICRO;
ad67971202381c Michael Hennerich  2020-03-24  292  }
ad67971202381c Michael Hennerich  2020-03-24  293  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki