From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Update several core ACPI device drivers that use
acpi_bus_generate_netlink_event() for generating netlink messages to
pass a string literal as its first argument instead of a pointer to
pnp.device_class in a given struct acpi_device, which will allow them
to avoid initializing the pnp.device_class field in the future.

The ACPI button driver that uses different acpi_device_class()
values for different button types will still pass it to
acpi_bus_generate_netlink_event(), but update it to use the
acpi_device_class() macro instead of open coding the pointer
access path.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/ac.c               |    6 +++---
 drivers/acpi/acpi_pad.c         |    4 ++--
 drivers/acpi/battery.c          |    2 +-
 drivers/acpi/button.c           |    2 +-
 drivers/acpi/processor_driver.c |   22 ++++++++--------------
 drivers/acpi/thermal.c          |    6 +++---
 6 files changed, 18 insertions(+), 24 deletions(-)

--- a/drivers/acpi/ac.c
+++ b/drivers/acpi/ac.c
@@ -130,9 +130,9 @@ static void acpi_ac_notify(acpi_handle h
 			msleep(ac_sleep_before_get_state_ms);
 
 		acpi_ac_get_state(ac);
-		acpi_bus_generate_netlink_event(adev->pnp.device_class,
-						  dev_name(&adev->dev), event,
-						  (u32) ac->state);
+		acpi_bus_generate_netlink_event(ACPI_AC_CLASS,
+						dev_name(&adev->dev), event,
+						ac->state);
 		acpi_notifier_call_chain(ACPI_AC_CLASS, acpi_device_bid(adev),
 					 event, ac->state);
 		power_supply_changed(ac->charger);
--- a/drivers/acpi/acpi_pad.c
+++ b/drivers/acpi/acpi_pad.c
@@ -413,8 +413,8 @@ static void acpi_pad_notify(acpi_handle
 	switch (event) {
 	case ACPI_PROCESSOR_AGGREGATOR_NOTIFY:
 		acpi_pad_handle_notify(handle);
-		acpi_bus_generate_netlink_event(adev->pnp.device_class,
-			dev_name(&adev->dev), event, 0);
+		acpi_bus_generate_netlink_event(ACPI_PROCESSOR_AGGREGATOR_CLASS,
+						dev_name(&adev->dev), event, 0);
 		break;
 	default:
 		pr_warn("Unsupported event [0x%x]\n", event);
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -1078,7 +1078,7 @@ static void acpi_battery_notify(acpi_han
 	if (event == ACPI_BATTERY_NOTIFY_INFO)
 		acpi_battery_refresh(battery);
 	acpi_battery_update(battery, false);
-	acpi_bus_generate_netlink_event(device->pnp.device_class,
+	acpi_bus_generate_netlink_event(ACPI_BATTERY_CLASS,
 					dev_name(&device->dev), event,
 					acpi_battery_present(battery));
 	acpi_notifier_call_chain(ACPI_BATTERY_CLASS, acpi_device_bid(device),
--- a/drivers/acpi/button.c
+++ b/drivers/acpi/button.c
@@ -468,7 +468,7 @@ static void acpi_button_notify(acpi_hand
 	input_report_key(input, keycode, 0);
 	input_sync(input);
 
-	acpi_bus_generate_netlink_event(device->pnp.device_class,
+	acpi_bus_generate_netlink_event(acpi_device_class(device),
 					dev_name(&device->dev),
 					event, ++button->pushed);
 }
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -53,7 +53,7 @@ static void acpi_processor_notify(acpi_h
 {
 	struct acpi_device *device = data;
 	struct acpi_processor *pr;
-	int saved;
+	int saved, ev_data = 0;
 
 	if (device->handle != handle)
 		return;
@@ -66,33 +66,27 @@ static void acpi_processor_notify(acpi_h
 	case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
 		saved = pr->performance_platform_limit;
 		acpi_processor_ppc_has_changed(pr, 1);
-		if (saved == pr->performance_platform_limit)
-			break;
-		acpi_bus_generate_netlink_event(device->pnp.device_class,
-						  dev_name(&device->dev), event,
-						  pr->performance_platform_limit);
+		ev_data = pr->performance_platform_limit;
+		if (saved == ev_data)
+			return;
+
 		break;
 	case ACPI_PROCESSOR_NOTIFY_POWER:
 		acpi_processor_power_state_has_changed(pr);
-		acpi_bus_generate_netlink_event(device->pnp.device_class,
-						  dev_name(&device->dev), event, 0);
 		break;
 	case ACPI_PROCESSOR_NOTIFY_THROTTLING:
 		acpi_processor_tstate_has_changed(pr);
-		acpi_bus_generate_netlink_event(device->pnp.device_class,
-						  dev_name(&device->dev), event, 0);
 		break;
 	case ACPI_PROCESSOR_NOTIFY_HIGEST_PERF_CHANGED:
 		cpufreq_update_limits(pr->id);
-		acpi_bus_generate_netlink_event(device->pnp.device_class,
-						  dev_name(&device->dev), event, 0);
 		break;
 	default:
 		acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event);
-		break;
+		return;
 	}
 
-	return;
+	acpi_bus_generate_netlink_event(ACPI_PROCESSOR_CLASS,
+					dev_name(&device->dev), event, ev_data);
 }
 
 static int __acpi_processor_start(struct acpi_device *device);
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -340,7 +340,7 @@ static void acpi_thermal_trips_update(st
 	thermal_zone_for_each_trip(tz->thermal_zone,
 				   acpi_thermal_adjust_trip, &atd);
 	acpi_queue_thermal_check(tz);
-	acpi_bus_generate_netlink_event(adev->pnp.device_class,
+	acpi_bus_generate_netlink_event(ACPI_THERMAL_CLASS,
 					dev_name(&adev->dev), event, 0);
 }
 
@@ -542,7 +542,7 @@ static void acpi_thermal_zone_device_hot
 {
 	struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
 
-	acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
+	acpi_bus_generate_netlink_event(ACPI_THERMAL_CLASS,
 					dev_name(&tz->device->dev),
 					ACPI_THERMAL_NOTIFY_HOT, 1);
 }
@@ -551,7 +551,7 @@ static void acpi_thermal_zone_device_cri
 {
 	struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
 
-	acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
+	acpi_bus_generate_netlink_event(ACPI_THERMAL_CLASS,
 					dev_name(&tz->device->dev),
 					ACPI_THERMAL_NOTIFY_CRITICAL, 1);