Merge tag 'thermal-6.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull thermal control fixes from Rafael Wysocki:
 "These fix two power allocator thermal governor issues and an ACPI
  thermal driver regression that all were introduced during the 6.8
  development cycle.

  Specifics:

   - Allow the power allocator thermal governor to bind to a thermal
     zone without cooling devices and/or without trip points (Nikita
     Travkin)

   - Make the ACPI thermal driver register a tripless thermal zone when
     it cannot find any usable trip points instead of returning an error
     from acpi_thermal_add() (Stephen Horvath)"

* tag 'thermal-6.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  thermal: gov_power_allocator: Allow binding without trip points
  thermal: gov_power_allocator: Allow binding without cooling devices
  ACPI: thermal: Register thermal zones without valid trip points

drivers/acpi/thermal.c

@@ -662,14 +662,15 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz,
 {
 	int result;
 
-	tz->thermal_zone = thermal_zone_device_register_with_trips("acpitz",
-								   trip_table,
-								   trip_count,
-								   tz,
-								   &acpi_thermal_zone_ops,
-								   NULL,
-								   passive_delay,
+	if (trip_count)
+		tz->thermal_zone = thermal_zone_device_register_with_trips(
+					"acpitz", trip_table, trip_count, tz,
+					&acpi_thermal_zone_ops, NULL, passive_delay,
 					tz->polling_frequency * 100);
+	else
+		tz->thermal_zone = thermal_tripless_zone_device_register(
+					"acpitz", tz, &acpi_thermal_zone_ops, NULL);
+
 	if (IS_ERR(tz->thermal_zone))
 		return PTR_ERR(tz->thermal_zone);
 
@@ -901,11 +902,8 @@ static int acpi_thermal_add(struct acpi_device *device)
 		trip++;
 	}
 
-	if (trip == trip_table) {
+	if (trip == trip_table)
 		pr_warn(FW_BUG "No valid trip points!\n");
-		result = -ENODEV;
-		goto free_memory;
-	}
 
 	result = acpi_thermal_register_thermal_zone(tz, trip_table,
 						    trip - trip_table,

drivers/thermal/gov_power_allocator.c

@@ -606,7 +606,7 @@ static int allocate_actors_buffer(struct power_allocator_params *params,
 
 	/* There might be no cooling devices yet. */
 	if (!num_actors) {
-		ret = -EINVAL;
+		ret = 0;
 		goto clean_state;
 	}
 
@@ -679,11 +679,6 @@ static int power_allocator_bind(struct thermal_zone_device *tz)
 		return -ENOMEM;
 
 	get_governor_trips(tz, params);
-	if (!params->trip_max) {
-		dev_warn(&tz->device, "power_allocator: missing trip_max\n");
-		kfree(params);
-		return -EINVAL;
-	}
 
 	ret = check_power_actors(tz, params);
 	if (ret < 0) {
@@ -714,6 +709,7 @@ static int power_allocator_bind(struct thermal_zone_device *tz)
 	else
 		params->sustainable_power = tz->tzp->sustainable_power;
 
+	if (params->trip_max)
 		estimate_pid_constants(tz, tz->tzp->sustainable_power,
 				       params->trip_switch_on,
 				       params->trip_max->temperature);