From: Axel Lin <axel.lin@ingics.com>
To: lm-sensors@vger.kernel.org
Subject: [lm-sensors] [PATCH] hwmon: (gpio-fan) Prevent overflow problem when writing large limits
Date: Sat, 02 Aug 2014 05:36:38 +0000 [thread overview]
Message-ID: <1406957798.14101.1.camel@phoenix> (raw)
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>
---
drivers/hwmon/gpio-fan.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/hwmon/gpio-fan.c b/drivers/hwmon/gpio-fan.c
index a43e5b0..4efa173 100644
--- a/drivers/hwmon/gpio-fan.c
+++ b/drivers/hwmon/gpio-fan.c
@@ -173,7 +173,7 @@ static int get_fan_speed_index(struct gpio_fan_data *fan_data)
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;
int i;
--
1.9.1
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next reply other threads:[~2014-08-02 5:36 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-02 5:36 Axel Lin [this message]
2014-08-04 14:28 ` [lm-sensors] [PATCH] hwmon: (gpio-fan) Prevent overflow problem when writing large limits Guenter Roeck
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