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iio: afe: rescale: use s64 for temporary scale calculations

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All four scaling coefficients can take signed values.
Make tmp a signed 64-bit integer and switch to div_s64() to preserve
signs during 64-bit divisions.

Fixes: 8b74816b5a ("iio: afe: rescale: new driver")
Signed-off-by: Liam Beguin <liambeguin@gmail.com>
Reviewed-by: Peter Rosin <peda@axentia.se>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20220108205319.2046348-5-liambeguin@gmail.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Liam Beguin 2022-01-08 15:53:07 -05:00 committed by Jonathan Cameron
parent ca85123354
commit 51593106b6
1 changed files with 4 additions and 4 deletions
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8
drivers/iio/afe/iio-rescale.c
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@ -39,7 +39,7 @@ static int rescale_read_raw(struct iio_dev *indio_dev,
int *val, int *val2, long mask)
{
struct rescale *rescale = iio_priv(indio_dev);
unsigned long long tmp;
s64 tmp;
int ret;
switch (mask) {
@ -77,10 +77,10 @@ static int rescale_read_raw(struct iio_dev *indio_dev,
*val2 = rescale->denominator;
return IIO_VAL_FRACTIONAL;
case IIO_VAL_FRACTIONAL_LOG2:
tmp = *val * 1000000000LL;
do_div(tmp, rescale->denominator);
tmp = (s64)*val * 1000000000LL;
tmp = div_s64(tmp, rescale->denominator);
tmp *= rescale->numerator;
do_div(tmp, 1000000000LL);
tmp = div_s64(tmp, 1000000000LL);
*val = tmp;
return ret;
default: