On Wed, 26 Jul 2017 23:32:06 +0200
Stefan Brüns <stefan.bruens@xxxxxxxxxxxxxx> wrote:
> Proper support for the INA219 lowered the minimum sampling period from
> 2*140us to 2*84us. Subtracting 200us later leads to an underflow and
> an almost infinite udelay later.
>
> Using a signed int for the sampling period provides sufficient range
> (at most 2*8640*1024us), but catches the underflow when comparing with
> buffer_us.
>
> Fixes: 18edac2e22f4 ("iio: adc: Fix integration time/averaging for INA219/220")
> Signed-off-by: Stefan Brüns <stefan.bruens@xxxxxxxxxxxxxx>
applied to the fixes-togreg branch of iio.git
Thanks,
Jonathan
> ---
> drivers/iio/adc/ina2xx-adc.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c
> index b0d9e3b80e6d..85b419ea9ba9 100644
> --- a/drivers/iio/adc/ina2xx-adc.c
> +++ b/drivers/iio/adc/ina2xx-adc.c
> @@ -657,7 +657,7 @@ static int ina2xx_capture_thread(void *data)
> {
> struct iio_dev *indio_dev = data;
> struct ina2xx_chip_info *chip = iio_priv(indio_dev);
> - unsigned int sampling_us = SAMPLING_PERIOD(chip);
> + int sampling_us = SAMPLING_PERIOD(chip);
> int buffer_us;
>
> /*
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