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hwmon: (gpio-fan) Prevent overflow problem when writing large limits 

commit 2565fb05d1e9fc0831f7b1c083bcfcb1cba1f020 upstream.

On platforms with sizeof(int) < sizeof(unsigned long), writing a rpm value
larger than MAXINT will result in unpredictable limit values written to the
chip. Avoid auto-conversion from unsigned long to int to fix the problem.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Axel Lin 2014-08-02 13:36:38 +08:00 committed by Greg Kroah-Hartman
parent 070d6526cc
commit 6dbbe15475
1 changed files with 1 additions and 1 deletions
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2
drivers/hwmon/gpio-fan.c
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@ -172,7 +172,7 @@ static int get_fan_speed_index(struct gpio_fan_data *fan_data)
return -EINVAL;
}
static int rpm_to_speed_index(struct gpio_fan_data *fan_data, int rpm)
static int rpm_to_speed_index(struct gpio_fan_data *fan_data, unsigned long rpm)
{
struct gpio_fan_speed *speed = fan_data->speed;
int i;