From ce15a81da33b961852f6e6a55305ccc60856de25 Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Sat, 24 Mar 2012 08:51:05 -0700 Subject: [PATCH] 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 Acked-by: Jean Delvare --- drivers/hwmon/adm1031.c | 20 ++++++++------------ 1 file 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, ®); - 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)) { -- 2.20.1