linux-kernel - Re: [PATCH 2/2] iio: adc: at91: fix wrong channel number in triggered buffer mode

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Date:   Sat, 22 Sep 2018 11:36:16 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     kbuild test robot <lkp@...el.com>
Cc:     Eugen Hristev <eugen.hristev@...rochip.com>, kbuild-all@...org,
        ludovic.desroches@...rochip.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-iio@...r.kernel.org, nicolas.ferre@...rochip.com,
        Maxime Ripard <maxime.ripard@...tlin.com>
Subject: Re: [PATCH 2/2] iio: adc: at91: fix wrong channel number in
 triggered buffer mode

On Fri, 21 Sep 2018 15:26:03 +0800
kbuild test robot <lkp@...el.com> wrote:

> Hi Eugen,
This one is leaving me stumped...

Anyone care to point out what I'm missing that is wrong here?

Also Eugen, please don't cc stable on a patch directly.  It is fine to send
a backport request once a patch has hit mainline, but before that it's just
adding noise to a list as they won't take it directly anyway.

Jonathan

> 
> I love your patch! Perhaps something to improve:
> 
> [auto build test WARNING on iio/togreg]
> [also build test WARNING on v4.19-rc4 next-20180919]
> [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/Eugen-Hristev/iio-adc-at91-fix-acking-DRDY-irq-on-simple-conversions/20180920-215908
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg
> config: arm-allmodconfig (attached as .config)
> compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0
> 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
>         GCC_VERSION=7.2.0 make.cross ARCH=arm 
> 
> All warnings (new ones prefixed by >>):
> 
>    drivers/iio/adc/at91_adc.c: In function 'at91_adc_trigger_handler':
> >> drivers/iio/adc/at91_adc.c:257:8: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]  
>       chan = idev->channels + i;
>            ^
> 
> vim +/const +257 drivers/iio/adc/at91_adc.c
> 
>    245	
>    246	static irqreturn_t at91_adc_trigger_handler(int irq, void *p)
>    247	{
>    248		struct iio_poll_func *pf = p;
>    249		struct iio_dev *idev = pf->indio_dev;
>    250		struct at91_adc_state *st = iio_priv(idev);
>    251		struct iio_chan_spec *chan;
>    252		int i, j = 0;
>    253	
>    254		for (i = 0; i < idev->masklength; i++) {
>    255			if (!test_bit(i, idev->active_scan_mask))
>    256				continue;
>  > 257			chan = idev->channels + i;  
>    258			st->buffer[j] = at91_adc_readl(st, AT91_ADC_CHAN(st, chan->channel));
>    259			j++;
>    260		}
>    261	
>    262		iio_push_to_buffers_with_timestamp(idev, st->buffer, pf->timestamp);
>    263	
>    264		iio_trigger_notify_done(idev->trig);
>    265	
>    266		/* Needed to ACK the DRDY interruption */
>    267		at91_adc_readl(st, AT91_ADC_LCDR);
>    268	
>    269		enable_irq(st->irq);
>    270	
>    271		return IRQ_HANDLED;
>    272	}
>    273	
> 
> ---
> 0-DAY kernel test infrastructure                Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation