thermal: core: Store zone ops in struct thermal_zone_device

The current code requires thermal zone creators to pass pointers to
writable ops structures to thermal_zone_device_register_with_trips()
which needs to modify the target struct thermal_zone_device_ops object
if the "critical" operation in it is NULL.

Moreover, the callers of thermal_zone_device_register_with_trips() are
required to hold on to the struct thermal_zone_device_ops object passed
to it until the given thermal zone is unregistered.

Both of these requirements are quite inconvenient, so modify struct
thermal_zone_device to contain struct thermal_zone_device_ops as field and
make thermal_zone_device_register_with_trips() copy the contents of the
struct thermal_zone_device_ops passed to it via a pointer (which can be
const now) to that field.

Also adjust the code using thermal zone ops accordingly and modify
thermal_of_zone_register() to use a local ops variable during
thermal zone registration so ops do not need to be freed in
thermal_of_zone_unregister() any more.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>

drivers/thermal/thermal_core.c

@@ -356,9 +356,9 @@ static void handle_critical_trips(struct thermal_zone_device *tz,
 	trace_thermal_zone_trip(tz, thermal_zone_trip_id(tz, trip), trip->type);
 
 	if (trip->type == THERMAL_TRIP_CRITICAL)
-		tz->ops->critical(tz);
-	else if (tz->ops->hot)
-		tz->ops->hot(tz);
+		tz->ops.critical(tz);
+	else if (tz->ops.hot)
+		tz->ops.hot(tz);
 }
 
 static void handle_thermal_trip(struct thermal_zone_device *tz,
@@ -493,8 +493,8 @@ static int thermal_zone_device_set_mode(struct thermal_zone_device *tz,
 		return ret;
 	}
 
-	if (tz->ops->change_mode)
-		ret = tz->ops->change_mode(tz, mode);
+	if (tz->ops.change_mode)
+		ret = tz->ops.change_mode(tz, mode);
 
 	if (!ret)
 		tz->mode = mode;
@@ -867,8 +867,8 @@ static void bind_cdev(struct thermal_cooling_device *cdev)
 	struct thermal_zone_device *pos = NULL;
 
 	list_for_each_entry(pos, &thermal_tz_list, node) {
-		if (pos->ops->bind) {
-			ret = pos->ops->bind(pos, cdev);
+		if (pos->ops.bind) {
+			ret = pos->ops.bind(pos, cdev);
 			if (ret)
 				print_bind_err_msg(pos, cdev, ret);
 		}
@@ -1184,8 +1184,8 @@ void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
 
 	/* Unbind all thermal zones associated with 'this' cdev */
 	list_for_each_entry(tz, &thermal_tz_list, node) {
-		if (tz->ops->unbind)
-			tz->ops->unbind(tz, cdev);
+		if (tz->ops.unbind)
+			tz->ops.unbind(tz, cdev);
 	}
 
 	mutex_unlock(&thermal_list_lock);
@@ -1199,13 +1199,13 @@ static void bind_tz(struct thermal_zone_device *tz)
 	int ret;
 	struct thermal_cooling_device *pos = NULL;
 
-	if (!tz->ops->bind)
+	if (!tz->ops.bind)
 		return;
 
 	mutex_lock(&thermal_list_lock);
 
 	list_for_each_entry(pos, &thermal_cdev_list, node) {
-		ret = tz->ops->bind(tz, pos);
+		ret = tz->ops.bind(tz, pos);
 		if (ret)
 			print_bind_err_msg(tz, pos, ret);
 	}
@@ -1224,8 +1224,8 @@ int thermal_zone_get_crit_temp(struct thermal_zone_device *tz, int *temp)
 {
 	int i, ret = -EINVAL;
 
-	if (tz->ops->get_crit_temp)
-		return tz->ops->get_crit_temp(tz, temp);
+	if (tz->ops.get_crit_temp)
+		return tz->ops.get_crit_temp(tz, temp);
 
 	mutex_lock(&tz->lock);
 
@@ -1273,7 +1273,7 @@ thermal_zone_device_register_with_trips(const char *type,
 					const struct thermal_trip *trips,
 					int num_trips, int mask,
 					void *devdata,
-					struct thermal_zone_device_ops *ops,
+					const struct thermal_zone_device_ops *ops,
 					const struct thermal_zone_params *tzp,
 					int passive_delay, int polling_delay)
 {
@@ -1348,10 +1348,10 @@ thermal_zone_device_register_with_trips(const char *type,
 	tz->id = id;
 	strscpy(tz->type, type, sizeof(tz->type));
 
-	if (!ops->critical)
-		ops->critical = thermal_zone_device_critical;
+	tz->ops = *ops;
+	if (!tz->ops.critical)
+		tz->ops.critical = thermal_zone_device_critical;
 
-	tz->ops = ops;
 	tz->device.class = thermal_class;
 	tz->devdata = devdata;
 	memcpy(tz->trips, trips, num_trips * sizeof(*trips));
@@ -1437,7 +1437,7 @@ EXPORT_SYMBOL_GPL(thermal_zone_device_register_with_trips);
 struct thermal_zone_device *thermal_tripless_zone_device_register(
 					const char *type,
 					void *devdata,
-					struct thermal_zone_device_ops *ops,
+					const struct thermal_zone_device_ops *ops,
 					const struct thermal_zone_params *tzp)
 {
 	return thermal_zone_device_register_with_trips(type, NULL, 0, 0, devdata,
@@ -1499,8 +1499,8 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
 
 	/* Unbind all cdevs associated with 'this' thermal zone */
 	list_for_each_entry(cdev, &thermal_cdev_list, node)
-		if (tz->ops->unbind)
-			tz->ops->unbind(tz, cdev);
+		if (tz->ops.unbind)
+			tz->ops.unbind(tz, cdev);
 
 	mutex_unlock(&thermal_list_lock);
 

drivers/thermal/thermal_helpers.c

@@ -26,8 +26,8 @@ int get_tz_trend(struct thermal_zone_device *tz, const struct thermal_trip *trip
 {
 	enum thermal_trend trend;
 
-	if (tz->emul_temperature || !tz->ops->get_trend ||
-	    tz->ops->get_trend(tz, trip, &trend)) {
+	if (tz->emul_temperature || !tz->ops.get_trend ||
+	    tz->ops.get_trend(tz, trip, &trend)) {
 		if (tz->temperature > tz->last_temperature)
 			trend = THERMAL_TREND_RAISING;
 		else if (tz->temperature < tz->last_temperature)
@@ -75,7 +75,7 @@ EXPORT_SYMBOL(get_thermal_instance);
  * temperature and fill @temp.
  *
  * Both tz and tz->ops must be valid pointers when calling this function,
- * and the tz->ops->get_temp callback must be provided.
+ * and the tz->ops.get_temp callback must be provided.
  * The function must be called under tz->lock.
  *
  * Return: On success returns 0, an error code otherwise
@@ -88,7 +88,7 @@ int __thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
 
 	lockdep_assert_held(&tz->lock);
 
-	ret = tz->ops->get_temp(tz, temp);
+	ret = tz->ops.get_temp(tz, temp);
 
 	if (IS_ENABLED(CONFIG_THERMAL_EMULATION) && tz->emul_temperature) {
 		for_each_trip(tz, trip) {
@@ -132,7 +132,7 @@ int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
 
 	mutex_lock(&tz->lock);
 
-	if (!tz->ops->get_temp) {
+	if (!tz->ops.get_temp) {
 		ret = -EINVAL;
 		goto unlock;
 	}

drivers/thermal/thermal_hwmon.c

@@ -80,7 +80,7 @@ temp_crit_show(struct device *dev, struct device_attribute *attr, char *buf)
 
 	mutex_lock(&tz->lock);
 
-	ret = tz->ops->get_crit_temp(tz, &temperature);
+	ret = tz->ops.get_crit_temp(tz, &temperature);
 
 	mutex_unlock(&tz->lock);
 
@@ -132,7 +132,7 @@ thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
 static bool thermal_zone_crit_temp_valid(struct thermal_zone_device *tz)
 {
 	int temp;
-	return tz->ops->get_crit_temp && !tz->ops->get_crit_temp(tz, &temp);
+	return tz->ops.get_crit_temp && !tz->ops.get_crit_temp(tz, &temp);
 }
 
 int thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)

drivers/thermal/thermal_of.c

@@ -438,11 +438,8 @@ static int thermal_of_unbind(struct thermal_zone_device *tz,
  */
 static void thermal_of_zone_unregister(struct thermal_zone_device *tz)
 {
-	struct thermal_zone_device_ops *ops = tz->ops;
-
 	thermal_zone_device_disable(tz);
 	thermal_zone_device_unregister(tz);
-	kfree(ops);
 }
 
 /**
@@ -468,33 +465,27 @@ static void thermal_of_zone_unregister(struct thermal_zone_device *tz)
 static struct thermal_zone_device *thermal_of_zone_register(struct device_node *sensor, int id, void *data,
 							    const struct thermal_zone_device_ops *ops)
 {
+	struct thermal_zone_device_ops of_ops = *ops;
 	struct thermal_zone_device *tz;
 	struct thermal_trip *trips;
 	struct thermal_zone_params tzp = {};
-	struct thermal_zone_device_ops *of_ops;
 	struct device_node *np;
 	const char *action;
 	int delay, pdelay;
 	int ntrips, mask;
 	int ret;
 
-	of_ops = kmemdup(ops, sizeof(*ops), GFP_KERNEL);
-	if (!of_ops)
-		return ERR_PTR(-ENOMEM);
-
 	np = of_thermal_zone_find(sensor, id);
 	if (IS_ERR(np)) {
 		if (PTR_ERR(np) != -ENODEV)
 			pr_err("Failed to find thermal zone for %pOFn id=%d\n", sensor, id);
-		ret = PTR_ERR(np);
-		goto out_kfree_of_ops;
+		return ERR_CAST(np);
 	}
 
 	trips = thermal_of_trips_init(np, &ntrips);
 	if (IS_ERR(trips)) {
 		pr_err("Failed to find trip points for %pOFn id=%d\n", sensor, id);
-		ret = PTR_ERR(trips);
-		goto out_kfree_of_ops;
+		return ERR_CAST(trips);
 	}
 
 	ret = thermal_of_monitor_init(np, &delay, &pdelay);
@@ -505,18 +496,18 @@ static struct thermal_zone_device *thermal_of_zone_register(struct device_node *
 
 	thermal_of_parameters_init(np, &tzp);
 
-	of_ops->bind = thermal_of_bind;
-	of_ops->unbind = thermal_of_unbind;
+	of_ops.bind = thermal_of_bind;
+	of_ops.unbind = thermal_of_unbind;
 
 	mask = GENMASK_ULL((ntrips) - 1, 0);
 
 	ret = of_property_read_string(np, "critical-action", &action);
 	if (!ret)
-		if (!of_ops->critical && !strcasecmp(action, "reboot"))
-			of_ops->critical = thermal_zone_device_critical_reboot;
+		if (!of_ops.critical && !strcasecmp(action, "reboot"))
+			of_ops.critical = thermal_zone_device_critical_reboot;
 
 	tz = thermal_zone_device_register_with_trips(np->name, trips, ntrips,
-						     mask, data, of_ops, &tzp,
+						     mask, data, &of_ops, &tzp,
 						     pdelay, delay);
 	if (IS_ERR(tz)) {
 		ret = PTR_ERR(tz);
@@ -538,8 +529,6 @@ static struct thermal_zone_device *thermal_of_zone_register(struct device_node *
 
 out_kfree_trips:
 	kfree(trips);
-out_kfree_of_ops:
-	kfree(of_ops);
 
 	return ERR_PTR(ret);
 }

drivers/thermal/thermal_sysfs.c

@@ -123,8 +123,8 @@ trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 	trip = &tz->trips[trip_id];
 
 	if (temp != trip->temperature) {
-		if (tz->ops->set_trip_temp) {
-			ret = tz->ops->set_trip_temp(tz, trip_id, temp);
+		if (tz->ops.set_trip_temp) {
+			ret = tz->ops.set_trip_temp(tz, trip_id, temp);
 			if (ret)
 				goto unlock;
 		}
@@ -174,8 +174,8 @@ trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 	trip = &tz->trips[trip_id];
 
 	if (hyst != trip->hysteresis) {
-		if (tz->ops->set_trip_hyst) {
-			ret = tz->ops->set_trip_hyst(tz, trip_id, hyst);
+		if (tz->ops.set_trip_hyst) {
+			ret = tz->ops.set_trip_hyst(tz, trip_id, hyst);
 			if (ret)
 				goto unlock;
 		}
@@ -250,10 +250,10 @@ emul_temp_store(struct device *dev, struct device_attribute *attr,
 
 	mutex_lock(&tz->lock);
 
-	if (!tz->ops->set_emul_temp)
+	if (!tz->ops.set_emul_temp)
 		tz->emul_temperature = temperature;
 	else
-		ret = tz->ops->set_emul_temp(tz, temperature);
+		ret = tz->ops.set_emul_temp(tz, temperature);
 
 	if (!ret)
 		__thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
@@ -474,7 +474,7 @@ static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
 					tz->trip_hyst_attrs[indx].name;
 		tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
 		tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
-		if (tz->ops->set_trip_hyst) {
+		if (tz->ops.set_trip_hyst) {
 			tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
 			tz->trip_hyst_attrs[indx].attr.store =
 					trip_point_hyst_store;

drivers/thermal/thermal_trip.c

@@ -70,7 +70,7 @@ void __thermal_zone_set_trips(struct thermal_zone_device *tz)
 
 	lockdep_assert_held(&tz->lock);
 
-	if (!tz->ops->set_trips)
+	if (!tz->ops.set_trips)
 		return;
 
 	for_each_trip(tz, trip) {
@@ -114,7 +114,7 @@ void __thermal_zone_set_trips(struct thermal_zone_device *tz)
 	 * Set a temperature window. When this window is left the driver
 	 * must inform the thermal core via thermal_zone_device_update.
 	 */
-	ret = tz->ops->set_trips(tz, low, high);
+	ret = tz->ops.set_trips(tz, low, high);
 	if (ret)
 		dev_err(&tz->device, "Failed to set trips: %d\n", ret);
 }

include/linux/thermal.h

@@ -182,7 +182,7 @@ struct thermal_zone_device {
 	int prev_low_trip;
 	int prev_high_trip;
 	atomic_t need_update;
-	struct thermal_zone_device_ops *ops;
+	struct thermal_zone_device_ops ops;
 	struct thermal_zone_params *tzp;
 	struct thermal_governor *governor;
 	void *governor_data;
@@ -318,14 +318,14 @@ struct thermal_zone_device *thermal_zone_device_register_with_trips(
 					const struct thermal_trip *trips,
 					int num_trips, int mask,
 					void *devdata,
-					struct thermal_zone_device_ops *ops,
+					const struct thermal_zone_device_ops *ops,
 					const struct thermal_zone_params *tzp,
 					int passive_delay, int polling_delay);
 
 struct thermal_zone_device *thermal_tripless_zone_device_register(
 					const char *type,
 					void *devdata,
-					struct thermal_zone_device_ops *ops,
+					const struct thermal_zone_device_ops *ops,
 					const struct thermal_zone_params *tzp);
 
 void thermal_zone_device_unregister(struct thermal_zone_device *tz);
@@ -378,7 +378,7 @@ static inline struct thermal_zone_device *thermal_zone_device_register_with_trip
 					const struct thermal_trip *trips,
 					int num_trips, int mask,
 					void *devdata,
-					struct thermal_zone_device_ops *ops,
+					const struct thermal_zone_device_ops *ops,
 					const struct thermal_zone_params *tzp,
 					int passive_delay, int polling_delay)
 { return ERR_PTR(-ENODEV); }