On 25/03/17 18:03, Jonathan Cameron wrote:
> On 24/03/17 12:41, Nikolaus Schulz wrote:
>> Fix formatting of negative values of type IIO_VAL_FRACTIONAL_LOG2 by
>> switching from do_div(), which can't handle negative numbers, to
>> div_s64_rem(). Also use shift_right for shifting, which is safe with
>> negative values.
>>
>> Signed-off-by: Nikolaus Schulz <nikolaus.schulz@xxxxxxxxxxxxxxxxx>
>> Cc: stable@xxxxxxxxxxxxxxx
> Looks sane to me, but I'd like to give others time to comment on this
> just in case there is some odd condition neither of us has thought of!
>
> Give me a poke if we get nothing else for a few weeks.
Lars, I think this might have been your magic in the first place.
Could you sanity check this one please. It's in the category of very
risky of both Nikolaus and I have missed something!
Thanks,
Jonathan
>
> Jonathan
>> ---
>> drivers/iio/industrialio-core.c | 7 +++----
>> 1 file changed, 3 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
>> index d18ded4..3ff91e0 100644
>> --- a/drivers/iio/industrialio-core.c
>> +++ b/drivers/iio/industrialio-core.c
>> @@ -610,10 +610,9 @@ static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type,
>> tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1);
>> return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
>> case IIO_VAL_FRACTIONAL_LOG2:
>> - tmp = (s64)vals[0] * 1000000000LL >> vals[1];
>> - tmp1 = do_div(tmp, 1000000000LL);
>> - tmp0 = tmp;
>> - return snprintf(buf, len, "%d.%09u", tmp0, tmp1);
>> + tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]);
>> + tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1);
>> + return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
>> case IIO_VAL_INT_MULTIPLE:
>> {
>> int i;
>>
>
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