[PATCH 3.14 15/66] hwmon: (emc2103) Clamp limits instead of bailing out

From: Greg Kroah-Hartman
Date: Tue Jul 15 2014 - 20:04:53 EST


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

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

From: Guenter Roeck <linux@xxxxxxxxxxxx>

commit f6c2dd20108c35e30e2c1f3c6142d189451a626b upstream.

It is customary to clamp limits instead of bailing out with an error
if a configured limit is out of the range supported by the driver.
This simplifies limit configuration, since the user will not typically
know chip and/or driver specific limits.

Reviewed-by: Jean Delvare <jdelvare@xxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/hwmon/emc2103.c | 15 +++++----------
1 file changed, 5 insertions(+), 10 deletions(-)

--- a/drivers/hwmon/emc2103.c
+++ b/drivers/hwmon/emc2103.c
@@ -250,9 +250,7 @@ static ssize_t set_temp_min(struct devic
if (result < 0)
return result;

- val = DIV_ROUND_CLOSEST(val, 1000);
- if ((val < -63) || (val > 127))
- return -EINVAL;
+ val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -63, 127);

mutex_lock(&data->update_lock);
data->temp_min[nr] = val;
@@ -274,9 +272,7 @@ static ssize_t set_temp_max(struct devic
if (result < 0)
return result;

- val = DIV_ROUND_CLOSEST(val, 1000);
- if ((val < -63) || (val > 127))
- return -EINVAL;
+ val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -63, 127);

mutex_lock(&data->update_lock);
data->temp_max[nr] = val;
@@ -390,15 +386,14 @@ static ssize_t set_fan_target(struct dev
{
struct emc2103_data *data = emc2103_update_device(dev);
struct i2c_client *client = to_i2c_client(dev);
- long rpm_target;
+ unsigned long rpm_target;

- int result = kstrtol(buf, 10, &rpm_target);
+ int result = kstrtoul(buf, 10, &rpm_target);
if (result < 0)
return result;

/* Datasheet states 16384 as maximum RPM target (table 3.2) */
- if ((rpm_target < 0) || (rpm_target > 16384))
- return -EINVAL;
+ rpm_target = clamp_val(rpm_target, 0, 16384);

mutex_lock(&data->update_lock);



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