linux-kernel - Re: [PATCH v2 5/5] iio: accel: Add support for Kionix/ROHM KX132-1211 accelerometer

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Date:   Sun, 23 Apr 2023 22:56:57 +0200
From:   Mehdi Djait <mehdi.djait.k@...il.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     kernel test robot <lkp@...el.com>, jic23@...nel.org,
        mazziesaccount@...il.com, oe-kbuild-all@...ts.linux.dev,
        krzysztof.kozlowski+dt@...aro.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 5/5] iio: accel: Add support for Kionix/ROHM
 KX132-1211 accelerometer

Hello Andy,

thank you for the review.

On Sat, Apr 22, 2023 at 07:09:12PM +0300, Andy Shevchenko wrote:
> On Sat, Apr 22, 2023 at 07:19:44AM +0800, kernel test robot wrote:
> > Hi Mehdi,
> > 
> > kernel test robot noticed the following build warnings:
> 
> I believe it's not just a warning, it's a full functional error in the code.
> 
> >    686	{
> >    687		struct device *dev = regmap_get_device(data->regmap);
> >    688		__le16 buf_status;
> >    689		int ret, fifo_bytes;
> >    690	
> >    691		ret = regmap_bulk_read(data->regmap, data->chip_info->buf_status1,
> >    692				       &buf_status, sizeof(buf_status));
> >    693		if (ret) {
> >    694			dev_err(dev, "Error reading buffer status\n");
> >    695			return ret;
> >    696		}
> >    697	
> >  > 698		buf_status &= data->chip_info->buf_smp_lvl_mask;
> >    699		fifo_bytes = le16_to_cpu(buf_status);
> 
> You need to mask in the same endianess space, i.o.w. either on CPU or device side.
> 
> I believe you wanted to have fifo_bytes to be masked, but I'm not sure.

I wanted to read the registers buf_status_1 and buf_status_2 --> 16 bits
and mask the result of the read to get the bits 0..9 which is the
buf_status: the number of bytes in the buffer

This is due to my lack of experience, but I have a question:
If I don't get any warnings when testing, how should I go about this ? I
will obviously fix this, but this is for the future.

--
Kind Regards
Mehdi Djait