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authorJean Delvare <khali@linux-fr.org>2005-11-21 19:22:16 +0100
committerChris Wright <chrisw@osdl.org>2005-11-24 14:10:12 -0800
commit4e980ac962bc77d292ad4039631553dd2a88d47f (patch)
tree565adf651a5803ac5fdb5ee3d6f255ac91829622
parentce79890ea55a84b3600bbee421be78117c2532bb (diff)
[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 <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Chris Wright <chrisw@osdl.org>
-rw-r--r--drivers/hwmon/it87.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c
index 53cc2b6d6385..0b0f47c8865a 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);