The following build warning is seen in some configurations.
drivers/hwmon/ad7314.c: In function 'ad7314_show_temperature':
drivers/hwmon/ad7314.c:70: warning: 'data' may be used uninitialized in this function
Fix by overloading the return value from ad7314_spi_read with both data and
error code (the returned data is really u16 and needs to be converted into a
signed value anyway).
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Cc: Jonathan Cameron <jic23@xxxxxxxxx>
---
drivers/hwmon/ad7314.c | 12 +++++-------
1 files changed, 5 insertions(+), 7 deletions(-)
diff --git a/drivers/hwmon/ad7314.c b/drivers/hwmon/ad7314.c
index ce43642..f85ce70 100644
--- a/drivers/hwmon/ad7314.c
+++ b/drivers/hwmon/ad7314.c
@@ -47,7 +47,7 @@ struct ad7314_data {
u16 rx ____cacheline_aligned;
};
-static int ad7314_spi_read(struct ad7314_data *chip, s16 *data)
+static int ad7314_spi_read(struct ad7314_data *chip)
{
int ret;
@@ -57,9 +57,7 @@ static int ad7314_spi_read(struct ad7314_data *chip, s16 *data)
return ret;
}
- *data = be16_to_cpu(chip->rx);
-
- return ret;
+ return be16_to_cpu(chip->rx);
}
static ssize_t ad7314_show_temperature(struct device *dev,
@@ -70,12 +68,12 @@ static ssize_t ad7314_show_temperature(struct device *dev,
s16 data;
int ret;
- ret = ad7314_spi_read(chip, &data);
+ ret = ad7314_spi_read(chip);
if (ret < 0)
return ret;
switch (spi_get_device_id(chip->spi_dev)->driver_data) {
case ad7314:
- data = (data & AD7314_TEMP_MASK) >> AD7314_TEMP_OFFSET;
+ data = (ret & AD7314_TEMP_MASK) >> AD7314_TEMP_OFFSET;
data = (data << 6) >> 6;
return sprintf(buf, "%d\n", 250 * data);
@@ -86,7 +84,7 @@ static ssize_t ad7314_show_temperature(struct device *dev,
* with a sign bit - which is a 14 bit 2's complement
* register. 1lsb - 31.25 milli degrees centigrade
*/
- data &= ADT7301_TEMP_MASK;
+ data = ret & ADT7301_TEMP_MASK;
data = (data << 2) >> 2;
return sprintf(buf, "%d\n",
--
1.7.5.4
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