From: Axel Lin <axel.lin@ingics.com>
Date: Thu, 31 Jul 2014 14:58:04 +0000 (+0800)
Subject: hwmon: (lm77) Prevent overflow problem when writing large limits
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~159^2~83
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=99765db299f0b07093318395f789a716ed23fc95;p=pandora-kernel.git

hwmon: (lm77) Prevent overflow problem when writing large limits

On platforms with sizeof(int) < sizeof(long), writing a temperature
limit larger than MAXINT will result in unpredictable limit values
written to the chip.
Clamp the input values to the supported limits first to fix the problem.

For set_temp_hyst:
As Guenter pointed out that the temperature is read as unsigned and stored in
an unsigned long. This is wrong; nothing in the datasheet suggests that the
value (the absolute temperature) must be positive.
So change it to signed.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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