Re: [PATCH v3 22/27] iio:adc:ti-adc084s021 Tidy up endian types

[Jonathan Cameron <jic23@jic23.retrosnub.co.uk>]

On Sun, 13 Sep 2020 13:01:46 +0100
Jonathan Cameron <jic23@kernel.org> wrote:

> On Sun, 9 Aug 2020 18:47:55 +0100
> Jonathan Cameron <jic23@kernel.org> wrote:
> 
> > On Wed, 22 Jul 2020 16:50:58 +0100
> > Jonathan Cameron <jic23@kernel.org> wrote:
> >   
> > > From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> > > 
> > > By adding a few local variables and avoiding a void * for
> > > a parameter we can easily make all the endian types explicit and
> > > get rid of the warnings from sparse:
> > > 
> > >   CHECK   drivers/iio/adc/ti-adc084s021.c
> > > drivers/iio/adc/ti-adc084s021.c:84:26: warning: incorrect type in assignment (different base types)
> > > drivers/iio/adc/ti-adc084s021.c:84:26:    expected unsigned short [usertype]
> > > drivers/iio/adc/ti-adc084s021.c:84:26:    got restricted __be16
> > > drivers/iio/adc/ti-adc084s021.c:115:24: warning: cast to restricted __be16
> > > drivers/iio/adc/ti-adc084s021.c:115:24: warning: cast to restricted __be16
> > > drivers/iio/adc/ti-adc084s021.c:115:24: warning: cast to restricted __be16
> > > drivers/iio/adc/ti-adc084s021.c:115:24: warning: cast to restricted __be16
> > > 
> > > Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>    
> > 
> > I'm a bit in 2 minds about this one.  The exact warning will change as the
> > result of the previous patch, but the problem is not introduced by that.
> > Technically it's not a 'fix' so I'll hold this one for now.  
> 
> Applied this one to the togreg branch of iio.git and pushed out as testing for
> the autobuilders to play with it.
And failed my local tests. Precursor not in my branch yet.
oops.
Dropped again for now.
> 
> Thanks,
> 
> Jonathan
> 
> > 
> > Jonathan
> >   
> > > ---
> > >  drivers/iio/adc/ti-adc084s021.c | 10 +++++-----
> > >  1 file changed, 5 insertions(+), 5 deletions(-)
> > > 
> > > diff --git a/drivers/iio/adc/ti-adc084s021.c b/drivers/iio/adc/ti-adc084s021.c
> > > index dfba34834a57..fb14b92fa6e7 100644
> > > --- a/drivers/iio/adc/ti-adc084s021.c
> > > +++ b/drivers/iio/adc/ti-adc084s021.c
> > > @@ -70,11 +70,10 @@ static const struct iio_chan_spec adc084s021_channels[] = {
> > >   * @adc: The ADC SPI data.
> > >   * @data: Buffer for converted data.
> > >   */
> > > -static int adc084s021_adc_conversion(struct adc084s021 *adc, void *data)
> > > +static int adc084s021_adc_conversion(struct adc084s021 *adc, __be16 *data)
> > >  {
> > >  	int n_words = (adc->spi_trans.len >> 1) - 1; /* Discard first word */
> > >  	int ret, i = 0;
> > > -	u16 *p = data;
> > >  
> > >  	/* Do the transfer */
> > >  	ret = spi_sync(adc->spi, &adc->message);
> > > @@ -82,7 +81,7 @@ static int adc084s021_adc_conversion(struct adc084s021 *adc, void *data)
> > >  		return ret;
> > >  
> > >  	for (; i < n_words; i++)
> > > -		*(p + i) = adc->rx_buf[i + 1];
> > > +		*(data + i) = adc->rx_buf[i + 1];
> > >  
> > >  	return ret;
> > >  }
> > > @@ -93,6 +92,7 @@ static int adc084s021_read_raw(struct iio_dev *indio_dev,
> > >  {
> > >  	struct adc084s021 *adc = iio_priv(indio_dev);
> > >  	int ret;
> > > +	__be16 be_val;
> > >  
> > >  	switch (mask) {
> > >  	case IIO_CHAN_INFO_RAW:
> > > @@ -107,13 +107,13 @@ static int adc084s021_read_raw(struct iio_dev *indio_dev,
> > >  		}
> > >  
> > >  		adc->tx_buf[0] = channel->channel << 3;
> > > -		ret = adc084s021_adc_conversion(adc, val);
> > > +		ret = adc084s021_adc_conversion(adc, &be_val);
> > >  		iio_device_release_direct_mode(indio_dev);
> > >  		regulator_disable(adc->reg);
> > >  		if (ret < 0)
> > >  			return ret;
> > >  
> > > -		*val = be16_to_cpu(*val);
> > > +		*val = be16_to_cpu(be_val);
> > >  		*val = (*val >> channel->scan_type.shift) & 0xff;
> > >  
> > >  		return IIO_VAL_INT;    
> >   
>