thermal: intel: Adjust ops handling during thermal zone registration

Because thermal zone operations are now stored directly in struct
thermal_zone_device, thermal zone creators can discard the operations
structure after the zone registration is complete, or it can be made
read-only.

Accordingly, make int340x_thermal_zone_add() use a local variable to
represent thermal zone operations, so it is freed automatically upon the
function exit, and make the other Intel thermal drivers use const zone
operations structures.

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>

Author: rafaeljw

drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c

@@ -61,12 +61,6 @@ static void int340x_thermal_critical(struct thermal_zone_device *zone)
 	dev_dbg(&zone->device, "%s: critical temperature reached\n", zone->type);
 }
 
-static struct thermal_zone_device_ops int340x_thermal_zone_ops = {
-	.get_temp       = int340x_thermal_get_zone_temp,
-	.set_trip_temp	= int340x_thermal_set_trip_temp,
-	.critical	= int340x_thermal_critical,
-};
-
 static inline void *int_to_trip_priv(int i)
 {
 	return (void *)(long)i;
@@ -126,6 +120,11 @@ static struct thermal_zone_params int340x_thermal_params = {
 struct int34x_thermal_zone *int340x_thermal_zone_add(struct acpi_device *adev,
 						     int (*get_temp) (struct thermal_zone_device *, int *))
 {
+	const struct thermal_zone_device_ops zone_ops = {
+		.set_trip_temp = int340x_thermal_set_trip_temp,
+		.critical = int340x_thermal_critical,
+		.get_temp = get_temp ? get_temp : int340x_thermal_get_zone_temp,
+	};
 	struct int34x_thermal_zone *int34x_zone;
 	struct thermal_trip *zone_trips;
 	unsigned long long trip_cnt = 0;
@@ -140,16 +139,6 @@ struct int34x_thermal_zone *int340x_thermal_zone_add(struct acpi_device *adev,
 
 	int34x_zone->adev = adev;
 
-	int34x_zone->ops = kmemdup(&int340x_thermal_zone_ops,
-				   sizeof(int340x_thermal_zone_ops), GFP_KERNEL);
-	if (!int34x_zone->ops) {
-		ret = -ENOMEM;
-		goto err_ops_alloc;
-	}
-
-	if (get_temp)
-		int34x_zone->ops->get_temp = get_temp;
-
 	status = acpi_evaluate_integer(adev->handle, "PATC", NULL, &trip_cnt);
 	if (ACPI_SUCCESS(status)) {
 		int34x_zone->aux_trip_nr = trip_cnt;
@@ -185,7 +174,7 @@ struct int34x_thermal_zone *int340x_thermal_zone_add(struct acpi_device *adev,
 							acpi_device_bid(adev),
 							zone_trips, trip_cnt,
 							trip_mask, int34x_zone,
-							int34x_zone->ops,
+							&zone_ops,
 							&int340x_thermal_params,
 							0, 0);
 	kfree(zone_trips);
@@ -205,8 +194,6 @@ struct int34x_thermal_zone *int340x_thermal_zone_add(struct acpi_device *adev,
 err_thermal_zone:
 	acpi_lpat_free_conversion_table(int34x_zone->lpat_table);
 err_trips_alloc:
-	kfree(int34x_zone->ops);
-err_ops_alloc:
 	kfree(int34x_zone);
 	return ERR_PTR(ret);
 }
@@ -216,7 +203,6 @@ void int340x_thermal_zone_remove(struct int34x_thermal_zone *int34x_zone)
 {
 	thermal_zone_device_unregister(int34x_zone->zone);
 	acpi_lpat_free_conversion_table(int34x_zone->lpat_table);
-	kfree(int34x_zone->ops);
 	kfree(int34x_zone);
 }
 EXPORT_SYMBOL_GPL(int340x_thermal_zone_remove);

drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.h

@@ -22,7 +22,6 @@ struct int34x_thermal_zone {
 	struct acpi_device *adev;
 	int aux_trip_nr;
 	struct thermal_zone_device *zone;
-	struct thermal_zone_device_ops *ops;
 	void *priv_data;
 	struct acpi_lpat_conversion_table *lpat_table;
 };

drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c

@@ -233,7 +233,7 @@ static int get_trip_temp(struct proc_thermal_pci *pci_info)
 	return temp;
 }
 
-static struct thermal_zone_device_ops tzone_ops = {
+static const struct thermal_zone_device_ops tzone_ops = {
 	.get_temp = sys_get_curr_temp,
 	.set_trip_temp	= sys_set_trip_temp,
 };

drivers/thermal/intel/intel_pch_thermal.c

@@ -132,7 +132,7 @@ static void pch_critical(struct thermal_zone_device *tzd)
 		thermal_zone_device_type(tzd));
 }
 
-static struct thermal_zone_device_ops tzd_ops = {
+static const struct thermal_zone_device_ops tzd_ops = {
 	.get_temp = pch_thermal_get_temp,
 	.critical = pch_critical,
 };

drivers/thermal/intel/intel_quark_dts_thermal.c

@@ -292,7 +292,7 @@ static int sys_change_mode(struct thermal_zone_device *tzd,
 	return ret;
 }
 
-static struct thermal_zone_device_ops tzone_ops = {
+static const struct thermal_zone_device_ops tzone_ops = {
 	.get_temp = sys_get_curr_temp,
 	.set_trip_temp = sys_set_trip_temp,
 	.change_mode = sys_change_mode,

drivers/thermal/intel/intel_soc_dts_iosf.c

@@ -168,7 +168,7 @@ static int sys_get_curr_temp(struct thermal_zone_device *tzd,
 	return 0;
 }
 
-static struct thermal_zone_device_ops tzone_ops = {
+static const struct thermal_zone_device_ops tzone_ops = {
 	.get_temp = sys_get_curr_temp,
 	.set_trip_temp = sys_set_trip_temp,
 };

drivers/thermal/intel/x86_pkg_temp_thermal.c

@@ -166,7 +166,7 @@ sys_set_trip_temp(struct thermal_zone_device *tzd, int trip, int temp)
 }
 
 /* Thermal zone callback registry */
-static struct thermal_zone_device_ops tzone_ops = {
+static const struct thermal_zone_device_ops tzone_ops = {
 	.get_temp = sys_get_curr_temp,
 	.set_trip_temp = sys_set_trip_temp,
 };