hwmon: (pmbus) Use long variables for register to data conversions

Using integer variable types for register to data conversions can cause
overflows especially for power calculations, which are in microwatt.
Use long variables instead.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Acked-by: Jean Delvare <khali@linux-fr.org>
Cc: stable@kernel.org # 2.6.39+

diff --git a/drivers/hwmon/pmbus_core.c b/drivers/hwmon/pmbus_core.c
index 744672c1f26d6be2b499f51e59d1dfead082d94d..8e31a8e2c746e8848c7268ab5c8091b966b648b4 100644 (file)
--- a/drivers/hwmon/pmbus_core.c
+++ b/drivers/hwmon/pmbus_core.c
@@ -362,8 +362,8 @@ static struct pmbus_data *pmbus_update_device(struct device *dev)
  * Convert linear sensor values to milli- or micro-units
  * depending on sensor type.
  */
-static int pmbus_reg2data_linear(struct pmbus_data *data,
-                                struct pmbus_sensor *sensor)
+static long pmbus_reg2data_linear(struct pmbus_data *data,
+                                 struct pmbus_sensor *sensor)
 {
        s16 exponent;
        s32 mantissa;
@@ -397,15 +397,15 @@ static int pmbus_reg2data_linear(struct pmbus_data *data,
        else
                val >>= -exponent;
 
-       return (int)val;
+       return val;
 }
 
 /*
  * Convert direct sensor values to milli- or micro-units
  * depending on sensor type.
  */
-static int pmbus_reg2data_direct(struct pmbus_data *data,
-                                struct pmbus_sensor *sensor)
+static long pmbus_reg2data_direct(struct pmbus_data *data,
+                                 struct pmbus_sensor *sensor)
 {
        long val = (s16) sensor->data;
        long m, b, R;
@@ -440,12 +440,12 @@ static int pmbus_reg2data_direct(struct pmbus_data *data,
                R++;
        }
 
-       return (int)((val - b) / m);
+       return (val - b) / m;
 }
 
-static int pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
+static long pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
 {
-       int val;
+       long val;
 
        if (data->info->direct[sensor->class])
                val = pmbus_reg2data_direct(data, sensor);
@@ -619,7 +619,7 @@ static int pmbus_get_boolean(struct pmbus_data *data, int index, int *val)
        if (!s1 && !s2)
                *val = !!regval;
        else {
-               int v1, v2;
+               long v1, v2;
                struct pmbus_sensor *sensor1, *sensor2;
 
                sensor1 = &data->sensors[s1];
@@ -661,7 +661,7 @@ static ssize_t pmbus_show_sensor(struct device *dev,
        if (sensor->data < 0)
                return sensor->data;
 
-       return snprintf(buf, PAGE_SIZE, "%d\n", pmbus_reg2data(data, sensor));
+       return snprintf(buf, PAGE_SIZE, "%ld\n", pmbus_reg2data(data, sensor));
 }
 
 static ssize_t pmbus_set_sensor(struct device *dev,