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thermal/core: Delete device under thermal device zone lock

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Thermal device attributes may still be opened after unregistering
the thermal zone and deleting the thermal device.

Currently there is no protection against accessing thermal device
operations after unregistering a thermal zone. To enable adding
such protection, protect the device delete operation with the
thermal zone device mutex. This requires splitting the call to
device_unregister() into its components, device_del() and put_device().
Only the first call can be executed under mutex protection, since
put_device() may result in releasing the thermal zone device memory.

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 07:24:53 -08:00 committed by Rafael J. Wysocki
parent d35f29ed9d
commit 30b2ae07d3
1 changed files with 6 additions and 1 deletions
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7
drivers/thermal/thermal_core.c
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@ -1391,7 +1391,12 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
thermal_remove_hwmon_sysfs(tz);
ida_free(&thermal_tz_ida, tz->id);
ida_destroy(&tz->ida);
device_unregister(&tz->device);
mutex_lock(&tz->lock);
device_del(&tz->device);
mutex_unlock(&tz->lock);
put_device(&tz->device);
thermal_notify_tz_delete(tz_id);
}