[PATCH 3.14 18/66] hwmon: (adm1021) Fix cache problem when writing temperature limits

From: Greg Kroah-Hartman
Date: Tue Jul 15 2014 - 20:03:45 EST


3.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Axel Lin <axel.lin@xxxxxxxxxx>

commit c024044d4da2c9c3b32933b4235df1e409293b84 upstream.

The module test script for the adm1021 driver exposes a cache problem
when writing temperature limits. temp_min and temp_max are expected
to be stored in milli-degrees C but are stored in degrees C.

Reported-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Axel Lin <axel.lin@xxxxxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/hwmon/adm1021.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)

--- a/drivers/hwmon/adm1021.c
+++ b/drivers/hwmon/adm1021.c
@@ -185,7 +185,7 @@ static ssize_t set_temp_max(struct devic
struct i2c_client *client = to_i2c_client(dev);
struct adm1021_data *data = i2c_get_clientdata(client);
long temp;
- int err;
+ int reg_val, err;

err = kstrtol(buf, 10, &temp);
if (err)
@@ -193,10 +193,11 @@ static ssize_t set_temp_max(struct devic
temp /= 1000;

mutex_lock(&data->update_lock);
- data->temp_max[index] = clamp_val(temp, -128, 127);
+ reg_val = clamp_val(temp, -128, 127);
+ data->temp_max[index] = reg_val * 1000;
if (!read_only)
i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index),
- data->temp_max[index]);
+ reg_val);
mutex_unlock(&data->update_lock);

return count;
@@ -210,7 +211,7 @@ static ssize_t set_temp_min(struct devic
struct i2c_client *client = to_i2c_client(dev);
struct adm1021_data *data = i2c_get_clientdata(client);
long temp;
- int err;
+ int reg_val, err;

err = kstrtol(buf, 10, &temp);
if (err)
@@ -218,10 +219,11 @@ static ssize_t set_temp_min(struct devic
temp /= 1000;

mutex_lock(&data->update_lock);
- data->temp_min[index] = clamp_val(temp, -128, 127);
+ reg_val = clamp_val(temp, -128, 127);
+ data->temp_min[index] = reg_val * 1000;
if (!read_only)
i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index),
- data->temp_min[index]);
+ reg_val);
mutex_unlock(&data->update_lock);

return count;


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