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| author | Guenter Roeck <linux@roeck-us.net> | 2012-04-20 11:39:17 -0400 |
|---|---|---|
| committer | Guenter Roeck <guenter.roeck@ericsson.com> | 2012-04-22 18:22:53 -0700 |
| commit | eae1415dda93fd4edcce0637aa64b3c9b567563f (patch) | |
| tree | 19437c6a34689a1286ec81f490f48b14c885ff9e /drivers/hwmon | |
| parent | 66f75a5d028beaf67c931435fdc3e7823125730c (diff) | |
| download | lwn-eae1415dda93fd4edcce0637aa64b3c9b567563f.tar.gz lwn-eae1415dda93fd4edcce0637aa64b3c9b567563f.zip | |
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>
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | 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 ce43642ef03e..f85ce70d9677 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", |