thermal: Fail object registration if thermal class is not registered

If thermal_class is not registered with the driver core, there is no way
to expose the interfaces used by the thermal control framework, so
prevent thermal zones and cooling devices from being registered in
that case by returning an error from object registration functions.

For this purpose, use a thermal_class pointer that will be NULL if the
class is not registered.  To avoid wasting memory in that case, allocate
the thermal class object dynamically and if it fails to register, free
it and clear the thermal_class pointer to NULL.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Zhang Rui <rui.zhang@intel.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/thermal/thermal_core.c

@@ -777,10 +777,7 @@ static void thermal_release(struct device *dev)
 	}
 }
 
-static struct class thermal_class = {
-	.name = "thermal",
-	.dev_release = thermal_release,
-};
+static struct class *thermal_class;
 
 static inline
 void print_bind_err_msg(struct thermal_zone_device *tz,
@@ -883,6 +880,9 @@ __thermal_cooling_device_register(struct device_node *np,
 	    !ops->set_cur_state)
 		return ERR_PTR(-EINVAL);
 
+	if (!thermal_class)
+		return ERR_PTR(-ENODEV);
+
 	cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
 	if (!cdev)
 		return ERR_PTR(-ENOMEM);
@@ -904,7 +904,7 @@ __thermal_cooling_device_register(struct device_node *np,
 	cdev->np = np;
 	cdev->ops = ops;
 	cdev->updated = false;
-	cdev->device.class = &thermal_class;
+	cdev->device.class = thermal_class;
 	cdev->devdata = devdata;
 
 	ret = cdev->ops->get_max_state(cdev, &cdev->max_state);
@@ -1256,6 +1256,9 @@ thermal_zone_device_register_with_trips(const char *type, struct thermal_trip *t
 	if (num_trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp) && !trips)
 		return ERR_PTR(-EINVAL);
 
+	if (!thermal_class)
+		return ERR_PTR(-ENODEV);
+
 	tz = kzalloc(sizeof(*tz), GFP_KERNEL);
 	if (!tz)
 		return ERR_PTR(-ENOMEM);
@@ -1277,7 +1280,7 @@ thermal_zone_device_register_with_trips(const char *type, struct thermal_trip *t
 
 	tz->ops = ops;
 	tz->tzp = tzp;
-	tz->device.class = &thermal_class;
+	tz->device.class = thermal_class;
 	tz->devdata = devdata;
 	tz->trips = trips;
 	tz->num_trips = num_trips;
@@ -1522,9 +1525,21 @@ static int __init thermal_init(void)
 	if (result)
 		goto unregister_netlink;
 
-	result = class_register(&thermal_class);
-	if (result)
+	thermal_class = kzalloc(sizeof(*thermal_class), GFP_KERNEL);
+	if (!thermal_class) {
+		result = -ENOMEM;
+		goto unregister_governors;
+	}
+
+	thermal_class->name = "thermal";
+	thermal_class->dev_release = thermal_release;
+
+	result = class_register(thermal_class);
+	if (result) {
+		kfree(thermal_class);
+		thermal_class = NULL;
 		goto unregister_governors;
+	}
 
 	result = register_pm_notifier(&thermal_pm_nb);
 	if (result)