linux-kernel - Re: [PATCH] iio: core: Avoid double minus in sysfs output

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Date:	Fri, 19 Jul 2013 09:15:39 +0300
From:	Oleksandr Kravchenko <o.v.kravchenko@...ballogic.com>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	Oleksandr Kravchenko <x0199363@...com>, jic23@....ac.uk,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: core: Avoid double minus in sysfs output

On Thu, Jul 18, 2013 at 7:24 PM, Lars-Peter Clausen <lars@...afoo.de> wrote:
> On 07/18/2013 05:47 PM, Oleksandr Kravchenko wrote:
>> From: Oleksandr Kravchenko <o.v.kravchenko@...ballogic.com>
>>
>> This patch fixes the issue with double minus in output when
>> reading channels from sysfs for IIO_VAL_INT_PLUS_MICRO and
>> IIO_VAL_INT_PLUS_NANO cases. Until this patch if val and val2
>> both are negatives output string contains "--" before
>> digits. It is result of "-%d..." in sprintf() format.
>>
>
> Hm, this might be a bug in a driver that is triggering this. The idea is
> that val2 is only allowed to be negative if val is 0.
>
> - Lars
>
If I calculate val and val2 in next way:
*val = adc / 1000000;
*val2 = adc % 1000000;
both val and val2 could by negative. Do I have to check it in my driver?
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