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

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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>
Cc: stable@vger.kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Axel Lin 2014-08-02 13:36:38 +08:00 • committed by Guenter Roeck
parent 18d03f3cbd
commit 2565fb05d1
1 changed files with 1 additions and 1 deletions
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2
drivers/hwmon/gpio-fan.c
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@ -173,7 +173,7 @@ static int get_fan_speed_index(struct gpio_fan_data *fan_data)
return -ENODEV; return -ENODEV;
} }
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; struct gpio_fan_speed *speed = fan_data->speed;
int i; int i;