From d3d89c468ceebbcf9423d1a3d66c5bf91f569570 Mon Sep 17 00:00:00 2001
From: Doug Anderson <dianders@chromium.org>
Date: Thu, 13 Feb 2014 14:39:34 -0800
Subject: [PATCH] hwmon: (ntc_thermistor) Avoid math overflow

The ntc thermistor code was doing math whose temporary result might
have overflowed 32-bits.  We need some casts in there to make it safe.

In one example I found:
- pullup_uV: 1800000
- result of iio_read_channel_raw: 3226
- 1800000 * 3226 => 0x15a1cbc80

Signed-off-by: Doug Anderson <dianders@chromium.org>
Cc: stable@vger.kernel.org # 3.10+
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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