linux-kernel - Re: [PATCH 15/15] iio: adc: ad4030: Add support for ADAQ4216 and ADAQ4224

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Message-ID: <202508310754.Y4V0Iq26-lkp@intel.com>
Date: Mon, 1 Sep 2025 14:47:33 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: oe-kbuild@...ts.linux.dev, Marcelo Schmitt <marcelo.schmitt@...log.com>,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, devicetree@...r.kernel.org,
	linux-spi@...r.kernel.org
Cc: lkp@...el.com, oe-kbuild-all@...ts.linux.dev, jic23@...nel.org,
	Michael.Hennerich@...log.com, nuno.sa@...log.com,
	eblanc@...libre.com, dlechner@...libre.com, andy@...nel.org,
	corbet@....net, robh@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, broonie@...nel.org,
	Jonathan.Cameron@...wei.com, andriy.shevchenko@...ux.intel.com,
	ahaslam@...libre.com, marcelo.schmitt1@...il.com
Subject: Re: [PATCH 15/15] iio: adc: ad4030: Add support for ADAQ4216 and
 ADAQ4224

Hi Marcelo,

kernel test robot noticed the following build warnings:

url:    https://github.com/intel-lab-lkp/linux/commits/Marcelo-Schmitt/iio-adc-ad4030-Fix-_scale-for-when-oversampling-is-enabled/20250830-084901
base:   91812d3843409c235f336f32f1c37ddc790f1e03
patch link:    https://lore.kernel.org/r/006ac88a667ce0d2c751946b562af83d0f27a44f.1756511030.git.marcelo.schmitt%40analog.com
patch subject: [PATCH 15/15] iio: adc: ad4030: Add support for ADAQ4216 and ADAQ4224
config: x86_64-randconfig-161-20250831 (https://download.01.org/0day-ci/archive/20250831/202508310754.Y4V0Iq26-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14+deb12u1) 12.2.0

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>
| Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
| Closes: https://lore.kernel.org/r/202508310754.Y4V0Iq26-lkp@intel.com/

smatch warnings:
drivers/iio/adc/ad4030.c:515 ad4030_set_pga() error: 'scan_type' dereferencing possible ERR_PTR()

vim +/scan_type +515 drivers/iio/adc/ad4030.c

8017880dd8ca3e Marcelo Schmitt 2025-08-29  502  static int ad4030_set_pga(struct iio_dev *indio_dev,
8017880dd8ca3e Marcelo Schmitt 2025-08-29  503  			  struct iio_chan_spec const *chan, int gain_int,
8017880dd8ca3e Marcelo Schmitt 2025-08-29  504  			  int gain_fract)
8017880dd8ca3e Marcelo Schmitt 2025-08-29  505  {
8017880dd8ca3e Marcelo Schmitt 2025-08-29  506  	struct ad4030_state *st = iio_priv(indio_dev);
8017880dd8ca3e Marcelo Schmitt 2025-08-29  507  	const struct iio_scan_type *scan_type;
8017880dd8ca3e Marcelo Schmitt 2025-08-29  508  	unsigned int mag_bits;
8017880dd8ca3e Marcelo Schmitt 2025-08-29  509  	u64 gain_nano, tmp;
8017880dd8ca3e Marcelo Schmitt 2025-08-29  510  
8017880dd8ca3e Marcelo Schmitt 2025-08-29  511  	if (!st->pga_gpios)
8017880dd8ca3e Marcelo Schmitt 2025-08-29  512  		return -EINVAL;
8017880dd8ca3e Marcelo Schmitt 2025-08-29  513  
8017880dd8ca3e Marcelo Schmitt 2025-08-29  514  	scan_type = iio_get_current_scan_type(indio_dev, chan);

	if (IS_ERR(scan_type))
		return PTR_ERR(scan_type);

8017880dd8ca3e Marcelo Schmitt 2025-08-29 @515  	if (scan_type->sign == 's')
8017880dd8ca3e Marcelo Schmitt 2025-08-29  516  		mag_bits = st->chip->precision_bits - 1;
8017880dd8ca3e Marcelo Schmitt 2025-08-29  517  	else
8017880dd8ca3e Marcelo Schmitt 2025-08-29  518  		mag_bits = st->chip->precision_bits;
8017880dd8ca3e Marcelo Schmitt 2025-08-29  519  
8017880dd8ca3e Marcelo Schmitt 2025-08-29  520  	gain_nano = gain_int * NANO + gain_fract;
8017880dd8ca3e Marcelo Schmitt 2025-08-29  521  
8017880dd8ca3e Marcelo Schmitt 2025-08-29  522  	if (!in_range(gain_nano, 0, ADAQ4616_GAIN_MAX_NANO))
8017880dd8ca3e Marcelo Schmitt 2025-08-29  523  		return -EINVAL;
8017880dd8ca3e Marcelo Schmitt 2025-08-29  524  
8017880dd8ca3e Marcelo Schmitt 2025-08-29  525  	tmp = DIV_ROUND_CLOSEST_ULL(gain_nano << mag_bits, NANO);
8017880dd8ca3e Marcelo Schmitt 2025-08-29  526  	gain_nano = DIV_ROUND_CLOSEST_ULL(st->vref_uv, tmp);
8017880dd8ca3e Marcelo Schmitt 2025-08-29  527  	st->pga_index = find_closest(gain_nano, ad4030_hw_gains,
8017880dd8ca3e Marcelo Schmitt 2025-08-29  528  				     ARRAY_SIZE(ad4030_hw_gains));
8017880dd8ca3e Marcelo Schmitt 2025-08-29  529  
8017880dd8ca3e Marcelo Schmitt 2025-08-29  530  	return ad4030_set_pga_gain(st);
8017880dd8ca3e Marcelo Schmitt 2025-08-29  531  }

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