tree a1d5f5ac471ef9c9a224632479e00623fd4c4a7e
parent 5dba4b14bafe801083d01e1f400816df7e5a8f2e
author Gregor Boirie <gregor.boirie@parrot.com> 1472840866 +0200
committer Jonathan Cameron <jic23@kernel.org> 1473106892 +0100

iio:core: fix IIO_VAL_FRACTIONAL sign handling

7985e7c100 ("iio: Introduce a new fractional value type") introduced a
new IIO_VAL_FRACTIONAL value type meant to represent rational type numbers
expressed by a numerator and denominator combination.

Formating of IIO_VAL_FRACTIONAL values relies upon do_div() usage. This
fails handling negative values properly since parameters are reevaluated
as unsigned values.
Fix this by using div_s64_rem() instead. Computed integer part will carry
properly signed value. Formatted fractional part will always be positive.

Fixes: 7985e7c100 ("iio: Introduce a new fractional value type")
Signed-off-by: Gregor Boirie <gregor.boirie@parrot.com>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>