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thermal/core: Protect hwmon accesses to thermal operations with thermal zone mutex

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In preparation to protecting access to thermal operations against thermal
zone device removal, protect hwmon accesses to thermal zone operations
with the thermal zone mutex. After acquiring the mutex, ensure that the
thermal zone device is registered before proceeding.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Guenter Roeck 2022-11-10 07:24:57 -08:00 committed by Rafael J. Wysocki
parent 1c439dec35
commit ea37bec51f
1 changed files with 9 additions and 1 deletions
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10
drivers/thermal/thermal_hwmon.c
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@ -77,7 +77,15 @@ temp_crit_show(struct device *dev, struct device_attribute *attr, char *buf)
int temperature;
int ret;
ret = tz->ops->get_crit_temp(tz, &temperature);
mutex_lock(&tz->lock);
if (device_is_registered(&tz->device))
ret = tz->ops->get_crit_temp(tz, &temperature);
else
ret = -ENODEV;
mutex_unlock(&tz->lock);
if (ret)
return ret;