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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+
This commit is contained in:
Guenter Roeck 2011-07-10 19:31:29 -07:00
parent 620917de59
commit f450c1504d
1 changed files with 10 additions and 10 deletions
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20
drivers/hwmon/pmbus_core.c
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@ -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,