ACPI: make remove callback of ACPI driver void

For bus-based driver, device removal is implemented as:
1 device_remove()->
2 bus->remove()->
3 driver->remove()

Driver core needs no inform from callee(bus driver) about the
result of remove callback. In that case, commit fc7a6209d571
("bus: Make remove callback return void") forces bus_type::remove
be void-returned.

Now we have the situation that both 1 & 2 of calling chain are
void-returned, so it does not make much sense for 3(driver->remove)
to return non-void to its caller.

So the basic idea behind this change is making remove() callback of
any bus-based driver to be void-returned.

This change, for itself, is for device drivers based on acpi-bus.

Acked-by: Uwe Kleine-König <[e-mail]>
Acked-by: Lee Jones <[e-mail]>
Acked-by: Dmitry Torokhov <[e-mail]>
Reviewed-by: Hans de Goede <[e-mail]>
Signed-off-by: Dawei Li <[e-mail]>
Reviewed-by: Maximilian Luz <[e-mail]> # for drivers/platform/surface/*
Signed-off-by: Rafael J. Wysocki <[e-mail]>

arch/ia64/hp/common/aml_nfw.c

···
 	return aml_nfw_add_global_handler();
 }
 
-static int aml_nfw_remove(struct acpi_device *device)
+static void aml_nfw_remove(struct acpi_device *device)
 {
-	return aml_nfw_remove_global_handler();
+	aml_nfw_remove_global_handler();
 }
 
 static const struct acpi_device_id aml_nfw_ids[] = {

arch/x86/platform/olpc/olpc-xo15-sci.c

···
 	return r;
 }
 
-static int xo15_sci_remove(struct acpi_device *device)
+static void xo15_sci_remove(struct acpi_device *device)
 {
 	acpi_disable_gpe(NULL, xo15_sci_gpe);
 	acpi_remove_gpe_handler(NULL, xo15_sci_gpe, xo15_sci_gpe_handler);
 	cancel_work_sync(&sci_work);
 	sysfs_remove_file(&device->dev.kobj, &lid_wake_on_close_attr.attr);
-	return 0;
 }
 
 #ifdef CONFIG_PM_SLEEP

drivers/acpi/ac.c

···
 MODULE_LICENSE("GPL");
 
 static int acpi_ac_add(struct acpi_device *device);
-static int acpi_ac_remove(struct acpi_device *device);
+static void acpi_ac_remove(struct acpi_device *device);
 static void acpi_ac_notify(struct acpi_device *device, u32 event);
 
 static const struct acpi_device_id ac_device_ids[] = {
···
 #define acpi_ac_resume NULL
 #endif
 
-static int acpi_ac_remove(struct acpi_device *device)
+static void acpi_ac_remove(struct acpi_device *device)
 {
 	struct acpi_ac *ac = NULL;
 
 	if (!device || !acpi_driver_data(device))
-		return -EINVAL;
+		return;
 
 	ac = acpi_driver_data(device);
 
···
 	unregister_acpi_notifier(&ac->battery_nb);
 
 	kfree(ac);
-
-	return 0;
 }
 
 static int __init acpi_ac_init(void)

drivers/acpi/acpi_pad.c

···
 	return 0;
 }
 
-static int acpi_pad_remove(struct acpi_device *device)
+static void acpi_pad_remove(struct acpi_device *device)
 {
 	mutex_lock(&isolated_cpus_lock);
 	acpi_pad_idle_cpus(0);
···
 	acpi_remove_notify_handler(device->handle,
 		ACPI_DEVICE_NOTIFY, acpi_pad_notify);
 	acpi_pad_remove_sysfs(device);
-	return 0;
 }
 
 static const struct acpi_device_id pad_device_ids[] = {

drivers/acpi/acpi_video.c

···
 static DEFINE_MUTEX(video_list_lock);
 static LIST_HEAD(video_bus_head);
 static int acpi_video_bus_add(struct acpi_device *device);
-static int acpi_video_bus_remove(struct acpi_device *device);
+static void acpi_video_bus_remove(struct acpi_device *device);
 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
 static void acpi_video_bus_register_backlight_work(struct work_struct *ignored);
 static DECLARE_DELAYED_WORK(video_bus_register_backlight_work,
···
 	return error;
 }
 
-static int acpi_video_bus_remove(struct acpi_device *device)
+static void acpi_video_bus_remove(struct acpi_device *device)
 {
 	struct acpi_video_bus *video = NULL;
 
 
 	if (!device || !acpi_driver_data(device))
-		return -EINVAL;
+		return;
 
 	video = acpi_driver_data(device);
 
···
 
 	kfree(video->attached_array);
 	kfree(video);
-
-	return 0;
 }
 
 static void acpi_video_bus_register_backlight_work(struct work_struct *ignored)

drivers/acpi/battery.c

···
 	return result;
 }
 
-static int acpi_battery_remove(struct acpi_device *device)
+static void acpi_battery_remove(struct acpi_device *device)
 {
 	struct acpi_battery *battery = NULL;
 
 	if (!device || !acpi_driver_data(device))
-		return -EINVAL;
+		return;
 	device_init_wakeup(&device->dev, 0);
 	battery = acpi_driver_data(device);
 	unregister_pm_notifier(&battery->pm_nb);
···
 	mutex_destroy(&battery->lock);
 	mutex_destroy(&battery->sysfs_lock);
 	kfree(battery);
-	return 0;
 }
 
 #ifdef CONFIG_PM_SLEEP

drivers/acpi/button.c

···
 };
 
 static int acpi_button_add(struct acpi_device *device);
-static int acpi_button_remove(struct acpi_device *device);
+static void acpi_button_remove(struct acpi_device *device);
 static void acpi_button_notify(struct acpi_device *device, u32 event);
 
 #ifdef CONFIG_PM_SLEEP
···
 	return error;
 }
 
-static int acpi_button_remove(struct acpi_device *device)
+static void acpi_button_remove(struct acpi_device *device)
 {
 	struct acpi_button *button = acpi_driver_data(device);
 
 	acpi_button_remove_fs(device);
 	input_unregister_device(button->input);
 	kfree(button);
-	return 0;
 }
 
 static int param_set_lid_init_state(const char *val,

drivers/acpi/ec.c

···
 	return ret;
 }
 
-static int acpi_ec_remove(struct acpi_device *device)
+static void acpi_ec_remove(struct acpi_device *device)
 {
 	struct acpi_ec *ec;
 
 	if (!device)
-		return -EINVAL;
+		return;
 
 	ec = acpi_driver_data(device);
 	release_region(ec->data_addr, 1);
···
 		ec_remove_handlers(ec);
 		acpi_ec_free(ec);
 	}
-	return 0;
 }
 
 static acpi_status

drivers/acpi/hed.c

···
 	return 0;
 }
 
-static int acpi_hed_remove(struct acpi_device *device)
+static void acpi_hed_remove(struct acpi_device *device)
 {
 	hed_handle = NULL;
-	return 0;
 }
 
 static struct acpi_driver acpi_hed_driver = {

drivers/acpi/nfit/core.c

···
 	return devm_add_action_or_reset(dev, acpi_nfit_shutdown, acpi_desc);
 }
 
-static int acpi_nfit_remove(struct acpi_device *adev)
+static void acpi_nfit_remove(struct acpi_device *adev)
 {
 	/* see acpi_nfit_unregister */
-	return 0;
 }
 
 static void acpi_nfit_update_notify(struct device *dev, acpi_handle handle)

drivers/acpi/sbs.c

···
 
 #define to_acpi_sbs(x) power_supply_get_drvdata(x)
 
-static int acpi_sbs_remove(struct acpi_device *device);
+static void acpi_sbs_remove(struct acpi_device *device);
 static int acpi_battery_get_state(struct acpi_battery *battery);
 
 static inline int battery_scale(int log)
···
 	return result;
 }
 
-static int acpi_sbs_remove(struct acpi_device *device)
+static void acpi_sbs_remove(struct acpi_device *device)
 {
 	struct acpi_sbs *sbs;
 	int id;
 
 	if (!device)
-		return -EINVAL;
+		return;
 	sbs = acpi_driver_data(device);
 	if (!sbs)
-		return -EINVAL;
+		return;
 	mutex_lock(&sbs->lock);
 	acpi_smbus_unregister_callback(sbs->hc);
 	for (id = 0; id < MAX_SBS_BAT; ++id)
···
 	mutex_unlock(&sbs->lock);
 	mutex_destroy(&sbs->lock);
 	kfree(sbs);
-	return 0;
 }
 
 #ifdef CONFIG_PM_SLEEP

drivers/acpi/sbshc.c

···
 };
 
 static int acpi_smbus_hc_add(struct acpi_device *device);
-static int acpi_smbus_hc_remove(struct acpi_device *device);
+static void acpi_smbus_hc_remove(struct acpi_device *device);
 
 static const struct acpi_device_id sbs_device_ids[] = {
 	{"ACPI0001", 0},
···
 
 extern void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit);
 
-static int acpi_smbus_hc_remove(struct acpi_device *device)
+static void acpi_smbus_hc_remove(struct acpi_device *device)
 {
 	struct acpi_smb_hc *hc;
 
 	if (!device)
-		return -EINVAL;
+		return;
 
 	hc = acpi_driver_data(device);
 	acpi_ec_remove_query_handler(hc->ec, hc->query_bit);
 	acpi_os_wait_events_complete();
 	kfree(hc);
 	device->driver_data = NULL;
-	return 0;
 }
 
 module_acpi_driver(acpi_smb_hc_driver);

drivers/acpi/thermal.c

···
 static struct workqueue_struct *acpi_thermal_pm_queue;
 
 static int acpi_thermal_add(struct acpi_device *device);
-static int acpi_thermal_remove(struct acpi_device *device);
+static void acpi_thermal_remove(struct acpi_device *device);
 static void acpi_thermal_notify(struct acpi_device *device, u32 event);
 
 static const struct acpi_device_id  thermal_device_ids[] = {
···
 	return result;
 }
 
-static int acpi_thermal_remove(struct acpi_device *device)
+static void acpi_thermal_remove(struct acpi_device *device)
 {
 	struct acpi_thermal *tz;
 
 	if (!device || !acpi_driver_data(device))
-		return -EINVAL;
+		return;
 
 	flush_workqueue(acpi_thermal_pm_queue);
 	tz = acpi_driver_data(device);
 
 	acpi_thermal_unregister_thermal_zone(tz);
 	kfree(tz);
-	return 0;
 }
 
 #ifdef CONFIG_PM_SLEEP

drivers/acpi/tiny-power-button.c

···
 };
 MODULE_DEVICE_TABLE(acpi, tiny_power_button_device_ids);
 
-static int acpi_noop_add_remove(struct acpi_device *device)
+static int acpi_noop_add(struct acpi_device *device)
 {
 	return 0;
+}
+
+static void acpi_noop_remove(struct acpi_device *device)
+{
 }
 
 static void acpi_tiny_power_button_notify(struct acpi_device *device, u32 event)
···
 	.class = "tiny-power-button",
 	.ids = tiny_power_button_device_ids,
 	.ops = {
-		.add = acpi_noop_add_remove,
-		.remove = acpi_noop_add_remove,
+		.add = acpi_noop_add,
+		.remove = acpi_noop_remove,
 		.notify = acpi_tiny_power_button_notify,
 	},
 };

drivers/char/sonypi.c

···
 	return 0;
 }
 
-static int sonypi_acpi_remove(struct acpi_device *device)
+static void sonypi_acpi_remove(struct acpi_device *device)
 {
 	sonypi_acpi_device = NULL;
-	return 0;
 }
 
 static const struct acpi_device_id sonypi_device_ids[] = {

drivers/char/tpm/tpm_crb.c

···
 	return tpm_chip_register(chip);
 }
 
-static int crb_acpi_remove(struct acpi_device *device)
+static void crb_acpi_remove(struct acpi_device *device)
 {
 	struct device *dev = &device->dev;
 	struct tpm_chip *chip = dev_get_drvdata(dev);
 
 	tpm_chip_unregister(chip);
-
-	return 0;
 }
 
 static const struct dev_pm_ops crb_pm = {

drivers/hv/vmbus_drv.c

···
 	return AE_OK;
 }
 
-static int vmbus_acpi_remove(struct acpi_device *device)
+static void vmbus_acpi_remove(struct acpi_device *device)
 {
 	struct resource *cur_res;
 	struct resource *next_res;
···
 			kfree(cur_res);
 		}
 	}
-
-	return 0;
 }
 
 static void vmbus_reserve_fb(void)

drivers/hwmon/acpi_power_meter.c

···
 	return res;
 }
 
-static int acpi_power_meter_remove(struct acpi_device *device)
+static void acpi_power_meter_remove(struct acpi_device *device)
 {
 	struct acpi_power_meter_resource *resource;
 
 	if (!device || !acpi_driver_data(device))
-		return -EINVAL;
+		return;
 
 	resource = acpi_driver_data(device);
 	hwmon_device_unregister(resource->hwmon_dev);
···
 	free_capabilities(resource);
 
 	kfree(resource);
-	return 0;
 }
 
 static int acpi_power_meter_resume(struct device *dev)

drivers/hwmon/asus_atk0110.c

···
 };
 
 static int atk_add(struct acpi_device *device);
-static int atk_remove(struct acpi_device *device);
+static void atk_remove(struct acpi_device *device);
 static void atk_print_sensor(struct atk_data *data, union acpi_object *obj);
 static int atk_read_value(struct atk_sensor_data *sensor, u64 *value);
 
···
 	return err;
 }
 
-static int atk_remove(struct acpi_device *device)
+static void atk_remove(struct acpi_device *device)
 {
 	struct atk_data *data = device->driver_data;
 	dev_dbg(&device->dev, "removing...\n");
···
 		if (atk_ec_ctl(data, 0))
 			dev_err(&device->dev, "Failed to disable EC\n");
 	}
-
-	return 0;
 }
 
 static int __init atk0110_init(void)

drivers/input/misc/atlas_btns.c

···
 	return err;
 }
 
-static int atlas_acpi_button_remove(struct acpi_device *device)
+static void atlas_acpi_button_remove(struct acpi_device *device)
 {
 	acpi_status status;
 
···
 		pr_err("error removing addr spc handler\n");
 
 	input_unregister_device(input_dev);
-
-	return 0;
 }
 
 static const struct acpi_device_id atlas_device_ids[] = {

drivers/net/fjes/fjes_main.c

···
 	return 0;
 }
 
-static int fjes_acpi_remove(struct acpi_device *device)
+static void fjes_acpi_remove(struct acpi_device *device)
 {
 	struct platform_device *plat_dev;
 
 	plat_dev = (struct platform_device *)acpi_driver_data(device);
 	platform_device_unregister(plat_dev);
-
-	return 0;
 }
 
 static struct acpi_driver fjes_acpi_driver = {

drivers/platform/chrome/chromeos_privacy_screen.c

···
 	return 0;
 }
 
-static int chromeos_privacy_screen_remove(struct acpi_device *adev)
+static void chromeos_privacy_screen_remove(struct acpi_device *adev)
 {
 	struct drm_privacy_screen *drm_privacy_screen =	acpi_driver_data(adev);
 
 	drm_privacy_screen_unregister(drm_privacy_screen);
-	return 0;
 }
 
 static const struct acpi_device_id chromeos_privacy_screen_device_ids[] = {

drivers/platform/chrome/wilco_ec/event.c

···
 	return error;
 }
 
-static int event_device_remove(struct acpi_device *adev)
+static void event_device_remove(struct acpi_device *adev)
 {
 	struct event_device_data *dev_data = adev->driver_data;
 
 	cdev_device_del(&dev_data->cdev, &dev_data->dev);
 	ida_simple_remove(&event_ida, MINOR(dev_data->dev.devt));
 	hangup_device(dev_data);
-
-	return 0;
 }
 
 static const struct acpi_device_id event_acpi_ids[] = {

drivers/platform/surface/surfacepro3_button.c

···
 	return error;
 }
 
-static int surface_button_remove(struct acpi_device *device)
+static void surface_button_remove(struct acpi_device *device)
 {
 	struct surface_button *button = acpi_driver_data(device);
 
 	input_unregister_device(button->input);
 	kfree(button);
-	return 0;
 }
 
 static SIMPLE_DEV_PM_OPS(surface_button_pm,

drivers/platform/x86/asus-laptop.c

···
 	return result;
 }
 
-static int asus_acpi_remove(struct acpi_device *device)
+static void asus_acpi_remove(struct acpi_device *device)
 {
 	struct asus_laptop *asus = acpi_driver_data(device);
 
···
 
 	kfree(asus->name);
 	kfree(asus);
-	return 0;
 }
 
 static const struct acpi_device_id asus_device_ids[] = {

drivers/platform/x86/asus-wireless.c

···
 	return err;
 }
 
-static int asus_wireless_remove(struct acpi_device *adev)
+static void asus_wireless_remove(struct acpi_device *adev)
 {
 	struct asus_wireless_data *data = acpi_driver_data(adev);
 
···
 		devm_led_classdev_unregister(&adev->dev, &data->led);
 		destroy_workqueue(data->wq);
 	}
-	return 0;
 }
 
 static struct acpi_driver asus_wireless_driver = {

drivers/platform/x86/classmate-laptop.c

···
 	return error;
 }
 
-static int cmpc_accel_remove_v4(struct acpi_device *acpi)
+static void cmpc_accel_remove_v4(struct acpi_device *acpi)
 {
 	device_remove_file(&acpi->dev, &cmpc_accel_sensitivity_attr_v4);
 	device_remove_file(&acpi->dev, &cmpc_accel_g_select_attr_v4);
-	return cmpc_remove_acpi_notify_device(acpi);
+	cmpc_remove_acpi_notify_device(acpi);
 }
 
 static SIMPLE_DEV_PM_OPS(cmpc_accel_pm, cmpc_accel_suspend_v4,
···
 	return error;
 }
 
-static int cmpc_accel_remove(struct acpi_device *acpi)
+static void cmpc_accel_remove(struct acpi_device *acpi)
 {
 	device_remove_file(&acpi->dev, &cmpc_accel_sensitivity_attr);
-	return cmpc_remove_acpi_notify_device(acpi);
+	cmpc_remove_acpi_notify_device(acpi);
 }
 
 static const struct acpi_device_id cmpc_accel_device_ids[] = {
···
 					   cmpc_tablet_idev_init);
 }
 
-static int cmpc_tablet_remove(struct acpi_device *acpi)
+static void cmpc_tablet_remove(struct acpi_device *acpi)
 {
-	return cmpc_remove_acpi_notify_device(acpi);
+	cmpc_remove_acpi_notify_device(acpi);
 }
 
 #ifdef CONFIG_PM_SLEEP
···
 	return retval;
 }
 
-static int cmpc_ipml_remove(struct acpi_device *acpi)
+static void cmpc_ipml_remove(struct acpi_device *acpi)
 {
 	struct ipml200_dev *ipml;
 
···
 	}
 
 	kfree(ipml);
-
-	return 0;
 }
 
 static const struct acpi_device_id cmpc_ipml_device_ids[] = {
···
 					   cmpc_keys_idev_init);
 }
 
-static int cmpc_keys_remove(struct acpi_device *acpi)
+static void cmpc_keys_remove(struct acpi_device *acpi)
 {
-	return cmpc_remove_acpi_notify_device(acpi);
+	cmpc_remove_acpi_notify_device(acpi);
 }
 
 static const struct acpi_device_id cmpc_keys_device_ids[] = {

drivers/platform/x86/dell/dell-rbtn.c

···
  */
 
 static int rbtn_add(struct acpi_device *device);
-static int rbtn_remove(struct acpi_device *device);
+static void rbtn_remove(struct acpi_device *device);
 static void rbtn_notify(struct acpi_device *device, u32 event);
 
 static const struct acpi_device_id rbtn_ids[] = {
···
 
 }
 
-static int rbtn_remove(struct acpi_device *device)
+static void rbtn_remove(struct acpi_device *device)
 {
 	struct rbtn_data *rbtn_data = device->driver_data;
 
···
 
 	rbtn_acquire(device, false);
 	device->driver_data = NULL;
-
-	return 0;
 }
 
 static void rbtn_notify(struct acpi_device *device, u32 event)

drivers/platform/x86/eeepc-laptop.c

···
 	return result;
 }
 
-static int eeepc_acpi_remove(struct acpi_device *device)
+static void eeepc_acpi_remove(struct acpi_device *device)
 {
 	struct eeepc_laptop *eeepc = acpi_driver_data(device);
 
···
 	eeepc_platform_exit(eeepc);
 
 	kfree(eeepc);
-	return 0;
 }
 
 

drivers/platform/x86/fujitsu-laptop.c

···
 	return ret;
 }
 
-static int acpi_fujitsu_laptop_remove(struct acpi_device *device)
+static void acpi_fujitsu_laptop_remove(struct acpi_device *device)
 {
 	struct fujitsu_laptop *priv = acpi_driver_data(device);
 
 	fujitsu_laptop_platform_remove(device);
 
 	kfifo_free(&priv->fifo);
-
-	return 0;
 }
 
 static void acpi_fujitsu_laptop_press(struct acpi_device *device, int scancode)

drivers/platform/x86/fujitsu-tablet.c

···
 	return 0;
 }
 
-static int acpi_fujitsu_remove(struct acpi_device *adev)
+static void acpi_fujitsu_remove(struct acpi_device *adev)
 {
 	free_irq(fujitsu.irq, fujitsu_interrupt);
 	release_region(fujitsu.io_base, fujitsu.io_length);
 	input_fujitsu_remove();
-	return 0;
 }
 
 #ifdef CONFIG_PM_SLEEP

drivers/platform/x86/intel/rst.c

···
 	return error;
 }
 
-static int irst_remove(struct acpi_device *acpi)
+static void irst_remove(struct acpi_device *acpi)
 {
 	device_remove_file(&acpi->dev, &irst_wakeup_attr);
 	device_remove_file(&acpi->dev, &irst_timeout_attr);
-
-	return 0;
 }
 
 static const struct acpi_device_id irst_ids[] = {

drivers/platform/x86/lg-laptop.c

···
 	return ret;
 }
 
-static int acpi_remove(struct acpi_device *device)
+static void acpi_remove(struct acpi_device *device)
 {
 	sysfs_remove_group(&pf_device->dev.kobj, &dev_attribute_group);
 
···
 	platform_device_unregister(pf_device);
 	pf_device = NULL;
 	platform_driver_unregister(&pf_driver);
-
-	return 0;
 }
 
 static const struct acpi_device_id device_ids[] = {

drivers/platform/x86/panasonic-laptop.c

···
 /* R1 handles SINF_AC_CUR_BRIGHT as SINF_CUR_BRIGHT, doesn't know AC state */
 
 static int acpi_pcc_hotkey_add(struct acpi_device *device);
-static int acpi_pcc_hotkey_remove(struct acpi_device *device);
+static void acpi_pcc_hotkey_remove(struct acpi_device *device);
 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event);
 
 static const struct acpi_device_id pcc_device_ids[] = {
···
 	return result;
 }
 
-static int acpi_pcc_hotkey_remove(struct acpi_device *device)
+static void acpi_pcc_hotkey_remove(struct acpi_device *device)
 {
 	struct pcc_acpi *pcc = acpi_driver_data(device);
 
 	if (!device || !pcc)
-		return -EINVAL;
+		return;
 
 	i8042_remove_filter(panasonic_i8042_filter);
 
···
 
 	kfree(pcc->sinf);
 	kfree(pcc);
-
-	return 0;
 }
 
 module_acpi_driver(acpi_pcc_driver);

drivers/platform/x86/sony-laptop.c

···
 	return result;
 }
 
-static int sony_nc_remove(struct acpi_device *device)
+static void sony_nc_remove(struct acpi_device *device)
 {
 	struct sony_nc_value *item;
 
···
 	sony_pf_remove();
 	sony_laptop_remove_input();
 	dprintk(SONY_NC_DRIVER_NAME " removed.\n");
-
-	return 0;
 }
 
 static const struct acpi_device_id sony_device_ids[] = {
···
  *  ACPI driver
  *
  *****************/
-static int sony_pic_remove(struct acpi_device *device)
+static void sony_pic_remove(struct acpi_device *device)
 {
 	struct sony_pic_ioport *io, *tmp_io;
 	struct sony_pic_irq *irq, *tmp_irq;
 
 	if (sony_pic_disable(device)) {
 		pr_err("Couldn't disable device\n");
-		return -ENXIO;
+		return;
 	}
 
 	free_irq(spic_dev.cur_irq->irq.interrupts[0], &spic_dev);
···
 	spic_dev.cur_irq = NULL;
 
 	dprintk(SONY_PIC_DRIVER_NAME " removed.\n");
-	return 0;
 }
 
 static int sony_pic_add(struct acpi_device *device)

drivers/platform/x86/system76_acpi.c

···
 }
 
 // Remove a System76 ACPI device
-static int system76_remove(struct acpi_device *acpi_dev)
+static void system76_remove(struct acpi_device *acpi_dev)
 {
 	struct system76_data *data;
 
···
 	devm_led_classdev_unregister(&acpi_dev->dev, &data->kb_led);
 
 	system76_get(data, "FINI");
-
-	return 0;
 }
 
 static struct acpi_driver system76_driver = {

drivers/platform/x86/topstar-laptop.c

···
 	return err;
 }
 
-static int topstar_acpi_remove(struct acpi_device *device)
+static void topstar_acpi_remove(struct acpi_device *device)
 {
 	struct topstar_laptop *topstar = acpi_driver_data(device);
 
···
 	topstar_acpi_exit(topstar);
 
 	kfree(topstar);
-	return 0;
 }
 
 static const struct acpi_device_id topstar_device_ids[] = {

drivers/platform/x86/toshiba_acpi.c

···
 	pr_cont("\n");
 }
 
-static int toshiba_acpi_remove(struct acpi_device *acpi_dev)
+static void toshiba_acpi_remove(struct acpi_device *acpi_dev)
 {
 	struct toshiba_acpi_dev *dev = acpi_driver_data(acpi_dev);
 
···
 		toshiba_acpi = NULL;
 
 	kfree(dev);
-
-	return 0;
 }
 
 static const char *find_hci_method(acpi_handle handle)

drivers/platform/x86/toshiba_bluetooth.c

···
 };
 
 static int toshiba_bt_rfkill_add(struct acpi_device *device);
-static int toshiba_bt_rfkill_remove(struct acpi_device *device);
+static void toshiba_bt_rfkill_remove(struct acpi_device *device);
 static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event);
 
 static const struct acpi_device_id bt_device_ids[] = {
···
 	return result;
 }
 
-static int toshiba_bt_rfkill_remove(struct acpi_device *device)
+static void toshiba_bt_rfkill_remove(struct acpi_device *device)
 {
 	struct toshiba_bluetooth_dev *bt_dev = acpi_driver_data(device);
 
···
 
 	kfree(bt_dev);
 
-	return toshiba_bluetooth_disable(device->handle);
+	toshiba_bluetooth_disable(device->handle);
 }
 
 module_acpi_driver(toshiba_bt_rfkill_driver);

drivers/platform/x86/toshiba_haps.c

···
 					event, 0);
 }
 
-static int toshiba_haps_remove(struct acpi_device *device)
+static void toshiba_haps_remove(struct acpi_device *device)
 {
 	sysfs_remove_group(&device->dev.kobj, &haps_attr_group);
 
 	if (toshiba_haps)
 		toshiba_haps = NULL;
-
-	return 0;
 }
 
 /* Helper function */

drivers/platform/x86/wireless-hotkey.c

···
 	return err;
 }
 
-static int wl_remove(struct acpi_device *device)
+static void wl_remove(struct acpi_device *device)
 {
 	wireless_input_destroy();
-	return 0;
 }
 
 static struct acpi_driver wl_driver = {

drivers/platform/x86/xo15-ebook.c

···
 	return error;
 }
 
-static int ebook_switch_remove(struct acpi_device *device)
+static void ebook_switch_remove(struct acpi_device *device)
 {
 	struct ebook_switch *button = acpi_driver_data(device);
 
 	input_unregister_device(button->input);
 	kfree(button);
-	return 0;
 }
 
 static struct acpi_driver xo15_ebook_driver = {

drivers/ptp/ptp_vmw.c

···
 	return 0;
 }
 
-static int ptp_vmw_acpi_remove(struct acpi_device *device)
+static void ptp_vmw_acpi_remove(struct acpi_device *device)
 {
 	ptp_clock_unregister(ptp_vmw_clock);
-	return 0;
 }
 
 static const struct acpi_device_id ptp_vmw_acpi_device_ids[] = {

drivers/thermal/intel/intel_menlow.c

···
 
 }
 
-static int intel_menlow_memory_remove(struct acpi_device *device)
+static void intel_menlow_memory_remove(struct acpi_device *device)
 {
 	struct thermal_cooling_device *cdev;
 
 	if (!device)
-		return -EINVAL;
+		return;
 
 	cdev = acpi_driver_data(device);
 	if (!cdev)
-		return -EINVAL;
+		return;
 
 	sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 	sysfs_remove_link(&cdev->device.kobj, "device");
 	thermal_cooling_device_unregister(cdev);
-
-	return 0;
 }
 
 static const struct acpi_device_id intel_menlow_memory_ids[] = {

drivers/video/backlight/apple_bl.c

···
 	return 0;
 }
 
-static int apple_bl_remove(struct acpi_device *dev)
+static void apple_bl_remove(struct acpi_device *dev)
 {
 	backlight_device_unregister(apple_backlight_device);
 
 	release_region(hw_data->iostart, hw_data->iolen);
 	hw_data = NULL;
-	return 0;
 }
 
 static const struct acpi_device_id apple_bl_ids[] = {

drivers/watchdog/ni903x_wdt.c

···
 	return 0;
 }
 
-static int ni903x_acpi_remove(struct acpi_device *device)
+static void ni903x_acpi_remove(struct acpi_device *device)
 {
 	struct ni903x_wdt *wdt = acpi_driver_data(device);
 
 	ni903x_wdd_stop(&wdt->wdd);
 	watchdog_unregister_device(&wdt->wdd);
-
-	return 0;
 }
 
 static const struct acpi_device_id ni903x_device_ids[] = {

drivers/xen/xen-acpi-pad.c

···
 	return 0;
 }
 
-static int acpi_pad_remove(struct acpi_device *device)
+static void acpi_pad_remove(struct acpi_device *device)
 {
 	mutex_lock(&xen_cpu_lock);
 	xen_acpi_pad_idle_cpus(0);
···
 
 	acpi_remove_notify_handler(device->handle,
 		ACPI_DEVICE_NOTIFY, acpi_pad_notify);
-	return 0;
 }
 
 static const struct acpi_device_id pad_device_ids[] = {

include/acpi/acpi_bus.h

···
  */
 
 typedef int (*acpi_op_add) (struct acpi_device * device);
-typedef int (*acpi_op_remove) (struct acpi_device * device);
+typedef void (*acpi_op_remove) (struct acpi_device *device);
 typedef void (*acpi_op_notify) (struct acpi_device * device, u32 event);
 
 struct acpi_device_ops {