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hwmon: (pmbus_core) Fix compiler warning

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Some configurations produce the following compiler warning:

drivers/hwmon/pmbus/pmbus_core.c: In function 'pmbus_show_boolean':
drivers/hwmon/pmbus/pmbus_core.c:752: warning: 'val' may be used uninitialized in this function

While this is a false positive, it can easily be fixed by overloading the return
value from pmbus_get_boolean with both val and error return code (val is a
boolean and thus never negative).

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
This commit is contained in:
Guenter Roeck 2012-03-28 09:14:03 -07:00 committed by Guenter Roeck
parent 1d0045ee4a
commit d7ee11157f
1 changed files with 8 additions and 9 deletions
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17
drivers/hwmon/pmbus/pmbus_core.c
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@ -710,13 +710,13 @@ static u16 pmbus_data2reg(struct pmbus_data *data,
* If a negative value is stored in any of the referenced registers, this value * If a negative value is stored in any of the referenced registers, this value
* reflects an error code which will be returned. * reflects an error code which will be returned.
*/ */
static int pmbus_get_boolean(struct pmbus_data *data, int index, int *val) static int pmbus_get_boolean(struct pmbus_data *data, int index)
{ {
u8 s1 = (index >> 24) & 0xff; u8 s1 = (index >> 24) & 0xff;
u8 s2 = (index >> 16) & 0xff; u8 s2 = (index >> 16) & 0xff;
u8 reg = (index >> 8) & 0xff; u8 reg = (index >> 8) & 0xff;
u8 mask = index & 0xff; u8 mask = index & 0xff;
int status; int ret, status;
u8 regval; u8 regval;
status = data->status[reg]; status = data->status[reg];
@ -725,7 +725,7 @@ static int pmbus_get_boolean(struct pmbus_data *data, int index, int *val)
regval = status & mask; regval = status & mask;
if (!s1 && !s2) if (!s1 && !s2)
*val = !!regval; ret = !!regval;
else { else {
long v1, v2; long v1, v2;
struct pmbus_sensor *sensor1, *sensor2; struct pmbus_sensor *sensor1, *sensor2;
@ -739,9 +739,9 @@ static int pmbus_get_boolean(struct pmbus_data *data, int index, int *val)
v1 = pmbus_reg2data(data, sensor1); v1 = pmbus_reg2data(data, sensor1);
v2 = pmbus_reg2data(data, sensor2); v2 = pmbus_reg2data(data, sensor2);
*val = !!(regval && v1 >= v2); ret = !!(regval && v1 >= v2);
} }
return 0; return ret;
} }
static ssize_t pmbus_show_boolean(struct device *dev, static ssize_t pmbus_show_boolean(struct device *dev,
@ -750,11 +750,10 @@ static ssize_t pmbus_show_boolean(struct device *dev,
struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct pmbus_data *data = pmbus_update_device(dev); struct pmbus_data *data = pmbus_update_device(dev);
int val; int val;
int err;
err = pmbus_get_boolean(data, attr->index, &val); val = pmbus_get_boolean(data, attr->index);
if (err) if (val < 0)
return err; return val;
return snprintf(buf, PAGE_SIZE, "%d\n", val); return snprintf(buf, PAGE_SIZE, "%d\n", val);
} }