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

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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;
mutex_lock(&data->update_lock);
it87_update_pwm_ctrl(data, nr);
if (has_newer_autopwm(data)) {
/*
* 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);
it87_update_pwm_ctrl(data, nr);
data->pwm_temp_map[nr] = reg;
/*
* If we are in automatic mode, write the temp mapping immediately;