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hwmon: (it87) Ensure that pwm control cache is current before updating values 

If sensor attributes were never read, the pwm control data has not been
initiialized, which can cause wrong driver behavior. Ensure that cached
data is current before acting on it.

Cc: stable@vger.kernel.org # 4.4+
Reported-by: Kevin Folz <kfolz@evertz.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2017-02-08 14:02:59 -08:00
parent 638c1c07f9
commit 82dbe987b7
1 changed files with 2 additions and 0 deletions
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2
drivers/hwmon/it87.c
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@ -1360,6 +1360,7 @@ static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
return -EINVAL; return -EINVAL;
mutex_lock(&data->update_lock); mutex_lock(&data->update_lock);
it87_update_pwm_ctrl(data, nr);
if (has_newer_autopwm(data)) { if (has_newer_autopwm(data)) {
/* /*
* If we are in automatic mode, the PWM duty cycle register * If we are in automatic mode, the PWM duty cycle register
@ -1472,6 +1473,7 @@ static ssize_t set_pwm_temp_map(struct device *dev,
} }
mutex_lock(&data->update_lock); mutex_lock(&data->update_lock);
it87_update_pwm_ctrl(data, nr);
data->pwm_temp_map[nr] = reg; data->pwm_temp_map[nr] = reg;
/* /*
* If we are in automatic mode, write the temp mapping immediately; * If we are in automatic mode, write the temp mapping immediately;