From 07eab46db7f78b2ed49bc9e41eda80695f93886f Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Wed, 23 Nov 2005 15:44:31 -0800 Subject: [PATCH] [PATCH] hwmon: Fix missing it87 fan div init Fix a bug where setting the low fan speed limits will not work if no data was ever read through the sysfs interface and the fan clock dividers have not been explicitely set yet either. The reason is that data->fan_div[nr] may currently be used before it is initialized from the chip register values. The fix is to explicitely initialize data->fan_div[nr] before using it. Bug reported, and fix tested, by Nicolas Mailhot. Signed-off-by: Jean Delvare Signed-off-by: Greg Kroah-Hartman Signed-off-by: Linus Torvalds --- drivers/hwmon/it87.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c index 6c41e25e670..a61f5d00f10 100644 --- a/drivers/hwmon/it87.c +++ b/drivers/hwmon/it87.c @@ -522,8 +522,15 @@ static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr, struct i2c_client *client = to_i2c_client(dev); struct it87_data *data = i2c_get_clientdata(client); int val = simple_strtol(buf, NULL, 10); + u8 reg = it87_read_value(client, IT87_REG_FAN_DIV); down(&data->update_lock); + switch (nr) { + case 0: data->fan_div[nr] = reg & 0x07; break; + case 1: data->fan_div[nr] = (reg >> 3) & 0x07; break; + case 2: data->fan_div[nr] = (reg & 0x40) ? 3 : 1; break; + } + data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr])); it87_write_value(client, IT87_REG_FAN_MIN(nr), data->fan_min[nr]); up(&data->update_lock); -- 2.41.0