linux-kernel - Re: [PATCH v2 2/2] staging: iio: ad7780: fix offset read value

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Date:   Sun, 28 Oct 2018 15:58:07 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Renato Lui Geh <renatogeh@...il.com>
Cc:     lars@...afoo.de, Michael.Hennerich@...log.com, knaack.h@....de,
        pmeerw@...erw.net, gregkh@...uxfoundation.org,
        alexandru.Ardelean@...log.com, stefan.popa@...log.com,
        giuliano.belinassi@....br, linux-iio@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        kernel-usp@...glegroups.com
Subject: Re: [PATCH v2 2/2] staging: iio: ad7780: fix offset read value

On Thu, 25 Oct 2018 19:30:37 -0300
Renato Lui Geh <renatogeh@...il.com> wrote:

> Variable val subtracted an uninitialized value on IIO_CHAN_INFO_OFFSET.
> This was fixed by assigning the correct value instead.
> 
> Signed-off-by: Renato Lui Geh <renatogeh@...il.com>

It obviously doesn't make much difference, but as you are respinning anyway...
Please could you always put fixes at the beginning of a set as it makes it
easier to back port them.  It think this one is simple enough that it is
worth applying to the stable kernels.

(naturally I could do that anyway as the rebase is trivial, so I'm just
encouraging good practice by asking you to do it in v3!)

Thanks,

Jonathan

> ---
>  drivers/staging/iio/adc/ad7780.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/iio/adc/ad7780.c b/drivers/staging/iio/adc/ad7780.c
> index 27972563bb6a..06700fe554a2 100644
> --- a/drivers/staging/iio/adc/ad7780.c
> +++ b/drivers/staging/iio/adc/ad7780.c
> @@ -100,7 +100,7 @@ static int ad7780_read_raw(struct iio_dev *indio_dev,
>  		*val2 = chan->scan_type.realbits - 1;
>  		return IIO_VAL_FRACTIONAL_LOG2;
>  	case IIO_CHAN_INFO_OFFSET:
> -		*val -= (1 << (chan->scan_type.realbits - 1));
> +		*val = -(1 << (chan->scan_type.realbits - 1));
>  		return IIO_VAL_INT;
>  	}
>