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authorGuenter Roeck <linux@roeck-us.net>2017-02-08 14:02:59 -0800
committerGuenter Roeck <linux@roeck-us.net>2017-02-10 21:35:08 -0800
commit82dbe987b70042b340f851bdc969a971081e5f02 (patch)
tree19558b051636f6c370f1bf5a452b971c64ff0655 /drivers/hwmon
parent638c1c07f99b752c14502009b50ffe4dd4de5ae2 (diff)
downloadlinux-82dbe987b70042b340f851bdc969a971081e5f02.tar.bz2
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>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/it87.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c
index 11a28b233006..85918d8a747a 100644
--- a/drivers/hwmon/it87.c
+++ b/drivers/hwmon/it87.c
@@ -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;