linux-kernel - Re: [PATCH] iio: adc: dln2-adc: initialize local struct before using it

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Date:   Tue, 12 Sep 2017 09:32:48 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Martin Kepplinger <martink@...teo.de>
Cc:     kbuild-all@...org, jic23@...nel.org, knaack.h@....de,
        lars@...afoo.de, pmeerw@...erw.net, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, Martin Kepplinger <martink@...teo.de>
Subject: Re: [PATCH] iio: adc: dln2-adc: initialize local struct before using
 it

Hi Martin,

[auto build test WARNING on iio/togreg]
[also build test WARNING on next-20170911]
[cannot apply to v4.13]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Martin-Kepplinger/iio-adc-dln2-adc-initialize-local-struct-before-using-it/20170912-064250
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg
config: tile-allyesconfig (attached as .config)
compiler: tilegx-linux-gcc (GCC) 4.6.2
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=tile 

All warnings (new ones prefixed by >>):

   drivers/iio/adc/dln2-adc.c: In function 'dln2_adc_trigger_h':
>> drivers/iio/adc/dln2-adc.c:492:2: warning: missing braces around initializer [-Wmissing-braces]
   drivers/iio/adc/dln2-adc.c:492:2: warning: (near initialization for 'data.values') [-Wmissing-braces]

vim +492 drivers/iio/adc/dln2-adc.c

   484	
   485	static irqreturn_t dln2_adc_trigger_h(int irq, void *p)
   486	{
   487		struct iio_poll_func *pf = p;
   488		struct iio_dev *indio_dev = pf->indio_dev;
   489		struct {
   490			__le16 values[DLN2_ADC_MAX_CHANNELS];
   491			int64_t timestamp_space;
 > 492		} data = { 0 };
   493		struct dln2_adc_get_all_vals dev_data;
   494		struct dln2_adc *dln2 = iio_priv(indio_dev);
   495		const struct dln2_adc_demux_table *t;
   496		int ret, i;
   497	
   498		mutex_lock(&dln2->mutex);
   499		ret = dln2_adc_read_all(dln2, &dev_data);
   500		mutex_unlock(&dln2->mutex);
   501		if (ret < 0)
   502			goto done;
   503	
   504		/* Demux operation */
   505		for (i = 0; i < dln2->demux_count; ++i) {
   506			t = &dln2->demux[i];
   507			memcpy((void *)data.values + t->to,
   508			       (void *)dev_data.values + t->from, t->length);
   509		}
   510	
   511		/* Zero padding space between values and timestamp */
   512		if (dln2->ts_pad_length)
   513			memset((void *)data.values + dln2->ts_pad_offset,
   514			       0, dln2->ts_pad_length);
   515	
   516		iio_push_to_buffers_with_timestamp(indio_dev, &data,
   517						   iio_get_time_ns(indio_dev));
   518	
   519	done:
   520		iio_trigger_notify_done(indio_dev->trig);
   521		return IRQ_HANDLED;
   522	}
   523	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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