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authorGuenter Roeck <linux@roeck-us.net>2012-03-24 08:51:05 -0700
committerGuenter Roeck <guenter.roeck@ericsson.com>2012-04-01 10:24:35 -0700
commitce15a81da33b961852f6e6a55305ccc60856de25 (patch)
tree5aebc56efafb1b8d0af2fcc453f7331b32e6021f /drivers/hwmon/adm1031.c
parent6394011d65b7e74666f07cca98747601cf8298fa (diff)
downloadlinux-ce15a81da33b961852f6e6a55305ccc60856de25.tar.bz2
hwmon: (adm1031) Fix compiler warning
Some configurations produce the following compile warning: drivers/hwmon/adm1031.c: In function 'set_fan_auto_channel': drivers/hwmon/adm1031.c:292: warning: 'reg' may be used uninitialized in this function While this is a false positive, it can easily be fixed by overloading the return value from get_fan_auto_nearest with both register value and error return code (the register value is never negative). Coincidentially, that also reduces module size by a few bytes. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Acked-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers/hwmon/adm1031.c')
-rw-r--r--drivers/hwmon/adm1031.c20
1 files changed, 8 insertions, 12 deletions
diff --git a/drivers/hwmon/adm1031.c b/drivers/hwmon/adm1031.c
index ff37363ea5bc..44e1fd7f3d81 100644
--- a/drivers/hwmon/adm1031.c
+++ b/drivers/hwmon/adm1031.c
@@ -233,18 +233,15 @@ static const auto_chan_table_t auto_channel_select_table_adm1030 = {
* nearest match if no exact match where found.
*/
static int
-get_fan_auto_nearest(struct adm1031_data *data,
- int chan, u8 val, u8 reg, u8 *new_reg)
+get_fan_auto_nearest(struct adm1031_data *data, int chan, u8 val, u8 reg)
{
int i;
int first_match = -1, exact_match = -1;
u8 other_reg_val =
(*data->chan_select_table)[FAN_CHAN_FROM_REG(reg)][chan ? 0 : 1];
- if (val == 0) {
- *new_reg = 0;
+ if (val == 0)
return 0;
- }
for (i = 0; i < 8; i++) {
if ((val == (*data->chan_select_table)[i][chan]) &&
@@ -264,13 +261,11 @@ get_fan_auto_nearest(struct adm1031_data *data,
}
if (exact_match >= 0)
- *new_reg = exact_match;
+ return exact_match;
else if (first_match >= 0)
- *new_reg = first_match;
- else
- return -EINVAL;
+ return first_match;
- return 0;
+ return -EINVAL;
}
static ssize_t show_fan_auto_channel(struct device *dev,
@@ -301,11 +296,12 @@ set_fan_auto_channel(struct device *dev, struct device_attribute *attr,
mutex_lock(&data->update_lock);
- ret = get_fan_auto_nearest(data, nr, val, data->conf1, &reg);
- if (ret) {
+ ret = get_fan_auto_nearest(data, nr, val, data->conf1);
+ if (ret < 0) {
mutex_unlock(&data->update_lock);
return ret;
}
+ reg = ret;
data->conf1 = FAN_CHAN_TO_REG(reg, data->conf1);
if ((data->conf1 & ADM1031_CONF1_AUTO_MODE) ^
(old_fan_mode & ADM1031_CONF1_AUTO_MODE)) {