diff options
| author | Guenter Roeck <linux@roeck-us.net> | 2022-11-10 07:24:57 -0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-11-14 19:04:37 +0100 |
| commit | ea37bec51ff442546e4a57d5cca2de9cc64a9df3 (patch) | |
| tree | af7d91ef27f6ddbf639148f7d50d680d78a40cc1 | |
| parent | 1c439dec359caa225c7752334c7a14ef9e3344c7 (diff) | |
thermal/core: Protect hwmon accesses to thermal operations with thermal zone mutex
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>
| -rw-r--r-- | drivers/thermal/thermal_hwmon.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/thermal/thermal_hwmon.c b/drivers/thermal/thermal_hwmon.c index f53f4ceb6a5d..c594c42bea6d 100644 --- a/drivers/thermal/thermal_hwmon.c +++ b/drivers/thermal/thermal_hwmon.c @@ -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; |