hwmon: (ad7314) Fix build warning

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@roeck-us.net>
Cc: Jonathan Cameron <jic23@cam.ac.uk>
Acked-by: Jean Delvare <khali@linux-fr.org>

diff --git a/drivers/hwmon/ad7314.c b/drivers/hwmon/ad7314.c
index ce43642..f85ce70 100644 (file)
--- 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",