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 <u.kleine-koenig@pengutronix.de>
Acked-by: Lee Jones <lee@kernel.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Dawei Li <set_pte_at@outlook.com>
Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com>  # for drivers/platform/surface/*
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

18 files changed, 33 insertions, 61 deletions

diff --git a/drivers/platform/x86/asus-laptop.c b/drivers/platform/x86/asus-laptop.c
index 47b2f8bb6fb5..761029f39314 100644
--- a/drivers/platform/x86/asus-laptop.c
+++ b/drivers/platform/x86/asus-laptop.c
@@ -1901,7 +1901,7 @@ fail_platform:
 	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);
 
@@ -1914,7 +1914,6 @@ static int asus_acpi_remove(struct acpi_device *device)
 
 	kfree(asus->name);
 	kfree(asus);
-	return 0;
 }
 
 static const struct acpi_device_id asus_device_ids[] = {
diff --git a/drivers/platform/x86/asus-wireless.c b/drivers/platform/x86/asus-wireless.c
index d3e7171928e5..abf01e00b799 100644
--- a/drivers/platform/x86/asus-wireless.c
+++ b/drivers/platform/x86/asus-wireless.c
@@ -175,7 +175,7 @@ static int asus_wireless_add(struct acpi_device *adev)
 	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);
 
@@ -183,7 +183,6 @@ static int asus_wireless_remove(struct acpi_device *adev)
 		devm_led_classdev_unregister(&adev->dev, &data->led);
 		destroy_workqueue(data->wq);
 	}
-	return 0;
 }
 
 static struct acpi_driver asus_wireless_driver = {
diff --git a/drivers/platform/x86/classmate-laptop.c b/drivers/platform/x86/classmate-laptop.c
index 9309ab5792cb..8b6a14611859 100644
--- a/drivers/platform/x86/classmate-laptop.c
+++ b/drivers/platform/x86/classmate-laptop.c
@@ -418,11 +418,11 @@ failed_sensitivity:
 	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,
@@ -648,10 +648,10 @@ failed_file:
 	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[] = {
@@ -727,9 +727,9 @@ static int cmpc_tablet_add(struct acpi_device *acpi)
 					   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
@@ -974,7 +974,7 @@ out_bd:
 	return retval;
 }
 
-static int cmpc_ipml_remove(struct acpi_device *acpi)
+static void cmpc_ipml_remove(struct acpi_device *acpi)
 {
 	struct ipml200_dev *ipml;
 
@@ -988,8 +988,6 @@ static int cmpc_ipml_remove(struct acpi_device *acpi)
 	}
 
 	kfree(ipml);
-
-	return 0;
 }
 
 static const struct acpi_device_id cmpc_ipml_device_ids[] = {
@@ -1055,9 +1053,9 @@ static int cmpc_keys_add(struct acpi_device *acpi)
 					   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[] = {
diff --git a/drivers/platform/x86/dell/dell-rbtn.c b/drivers/platform/x86/dell/dell-rbtn.c
index a89fad47ff13..aa0e6c907494 100644
--- a/drivers/platform/x86/dell/dell-rbtn.c
+++ b/drivers/platform/x86/dell/dell-rbtn.c
@@ -206,7 +206,7 @@ static void rbtn_input_event(struct rbtn_data *rbtn_data)
  */
 
 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[] = {
@@ -426,7 +426,7 @@ static int rbtn_add(struct acpi_device *device)
 
 }
 
-static int rbtn_remove(struct acpi_device *device)
+static void rbtn_remove(struct acpi_device *device)
 {
 	struct rbtn_data *rbtn_data = device->driver_data;
 
@@ -443,8 +443,6 @@ static int rbtn_remove(struct acpi_device *device)
 
 	rbtn_acquire(device, false);
 	device->driver_data = NULL;
-
-	return 0;
 }
 
 static void rbtn_notify(struct acpi_device *device, u32 event)
diff --git a/drivers/platform/x86/eeepc-laptop.c b/drivers/platform/x86/eeepc-laptop.c
index a388a28b6f2a..62b71e8e3567 100644
--- a/drivers/platform/x86/eeepc-laptop.c
+++ b/drivers/platform/x86/eeepc-laptop.c
@@ -1440,7 +1440,7 @@ fail_platform:
 	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);
 
@@ -1451,7 +1451,6 @@ static int eeepc_acpi_remove(struct acpi_device *device)
 	eeepc_platform_exit(eeepc);
 
 	kfree(eeepc);
-	return 0;
 }
 
 
diff --git a/drivers/platform/x86/fujitsu-laptop.c b/drivers/platform/x86/fujitsu-laptop.c
index b543d117b12c..085e044e888e 100644
--- a/drivers/platform/x86/fujitsu-laptop.c
+++ b/drivers/platform/x86/fujitsu-laptop.c
@@ -847,15 +847,13 @@ err_free_fifo:
 	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)
diff --git a/drivers/platform/x86/fujitsu-tablet.c b/drivers/platform/x86/fujitsu-tablet.c
index 7fb7fe5eb55a..17f08ce7552d 100644
--- a/drivers/platform/x86/fujitsu-tablet.c
+++ b/drivers/platform/x86/fujitsu-tablet.c
@@ -484,12 +484,11 @@ static int acpi_fujitsu_add(struct acpi_device *adev)
 	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
diff --git a/drivers/platform/x86/intel/rst.c b/drivers/platform/x86/intel/rst.c
index 3b81cb896fed..35814a7707af 100644
--- a/drivers/platform/x86/intel/rst.c
+++ b/drivers/platform/x86/intel/rst.c
@@ -113,12 +113,10 @@ static int irst_add(struct acpi_device *acpi)
 	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[] = {
diff --git a/drivers/platform/x86/lg-laptop.c b/drivers/platform/x86/lg-laptop.c
index 332868b140ed..1452110d36ad 100644
--- a/drivers/platform/x86/lg-laptop.c
+++ b/drivers/platform/x86/lg-laptop.c
@@ -761,7 +761,7 @@ out_platform_registered:
 	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);
 
@@ -773,8 +773,6 @@ static int acpi_remove(struct acpi_device *device)
 	platform_device_unregister(pf_device);
 	pf_device = NULL;
 	platform_driver_unregister(&pf_driver);
-
-	return 0;
 }
 
 static const struct acpi_device_id device_ids[] = {
diff --git a/drivers/platform/x86/panasonic-laptop.c b/drivers/platform/x86/panasonic-laptop.c
index ad3083f9946d..cf845ee1c7b1 100644
--- a/drivers/platform/x86/panasonic-laptop.c
+++ b/drivers/platform/x86/panasonic-laptop.c
@@ -183,7 +183,7 @@ enum SINF_BITS { SINF_NUM_BATTERIES = 0,
 /* 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[] = {
@@ -1065,12 +1065,12 @@ out_hotkey:
 	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);
 
@@ -1088,8 +1088,6 @@ static int acpi_pcc_hotkey_remove(struct acpi_device *device)
 
 	kfree(pcc->sinf);
 	kfree(pcc);
-
-	return 0;
 }
 
 module_acpi_driver(acpi_pcc_driver);
diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
index 765fcaba4d12..a19aac70252f 100644
--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -3263,7 +3263,7 @@ outwalk:
 	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;
 
@@ -3280,8 +3280,6 @@ static int sony_nc_remove(struct acpi_device *device)
 	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[] = {
@@ -4630,14 +4628,14 @@ found:
  *  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);
@@ -4667,7 +4665,6 @@ static int sony_pic_remove(struct acpi_device *device)
 	spic_dev.cur_irq = NULL;
 
 	dprintk(SONY_PIC_DRIVER_NAME " removed.\n");
-	return 0;
 }
 
 static int sony_pic_add(struct acpi_device *device)
diff --git a/drivers/platform/x86/system76_acpi.c b/drivers/platform/x86/system76_acpi.c
index 958df41ad509..52d94d8b1f25 100644
--- a/drivers/platform/x86/system76_acpi.c
+++ b/drivers/platform/x86/system76_acpi.c
@@ -744,7 +744,7 @@ error:
 }
 
 // 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;
 
@@ -760,8 +760,6 @@ static int system76_remove(struct acpi_device *acpi_dev)
 	devm_led_classdev_unregister(&acpi_dev->dev, &data->kb_led);
 
 	system76_get(data, "FINI");
-
-	return 0;
 }
 
 static struct acpi_driver system76_driver = {
diff --git a/drivers/platform/x86/topstar-laptop.c b/drivers/platform/x86/topstar-laptop.c
index 6d18fbf8762b..20df1ebefc30 100644
--- a/drivers/platform/x86/topstar-laptop.c
+++ b/drivers/platform/x86/topstar-laptop.c
@@ -332,7 +332,7 @@ err_free:
 	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);
 
@@ -344,7 +344,6 @@ static int topstar_acpi_remove(struct acpi_device *device)
 	topstar_acpi_exit(topstar);
 
 	kfree(topstar);
-	return 0;
 }
 
 static const struct acpi_device_id topstar_device_ids[] = {
diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
index 160abd3b3af8..ce6a735b1abd 100644
--- a/drivers/platform/x86/toshiba_acpi.c
+++ b/drivers/platform/x86/toshiba_acpi.c
@@ -3186,7 +3186,7 @@ static void print_supported_features(struct toshiba_acpi_dev *dev)
 	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);
 
@@ -3234,8 +3234,6 @@ static int toshiba_acpi_remove(struct acpi_device *acpi_dev)
 		toshiba_acpi = NULL;
 
 	kfree(dev);
-
-	return 0;
 }
 
 static const char *find_hci_method(acpi_handle handle)
diff --git a/drivers/platform/x86/toshiba_bluetooth.c b/drivers/platform/x86/toshiba_bluetooth.c
index 57a5dc60c58a..d8f81962a240 100644
--- a/drivers/platform/x86/toshiba_bluetooth.c
+++ b/drivers/platform/x86/toshiba_bluetooth.c
@@ -36,7 +36,7 @@ struct toshiba_bluetooth_dev {
 };
 
 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[] = {
@@ -279,7 +279,7 @@ static int toshiba_bt_rfkill_add(struct acpi_device *device)
 	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);
 
@@ -291,7 +291,7 @@ static int toshiba_bt_rfkill_remove(struct acpi_device *device)
 
 	kfree(bt_dev);
 
-	return toshiba_bluetooth_disable(device->handle);
+	toshiba_bluetooth_disable(device->handle);
 }
 
 module_acpi_driver(toshiba_bt_rfkill_driver);
diff --git a/drivers/platform/x86/toshiba_haps.c b/drivers/platform/x86/toshiba_haps.c
index 49e84095bb01..8c9f76286b08 100644
--- a/drivers/platform/x86/toshiba_haps.c
+++ b/drivers/platform/x86/toshiba_haps.c
@@ -138,14 +138,12 @@ static void toshiba_haps_notify(struct acpi_device *device, u32 event)
 					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 */
diff --git a/drivers/platform/x86/wireless-hotkey.c b/drivers/platform/x86/wireless-hotkey.c
index 11c60a273446..c64d9f084404 100644
--- a/drivers/platform/x86/wireless-hotkey.c
+++ b/drivers/platform/x86/wireless-hotkey.c
@@ -83,10 +83,9 @@ static int wl_add(struct acpi_device *device)
 	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 = {
diff --git a/drivers/platform/x86/xo15-ebook.c b/drivers/platform/x86/xo15-ebook.c
index 97440462aa25..391f7ea4431e 100644
--- a/drivers/platform/x86/xo15-ebook.c
+++ b/drivers/platform/x86/xo15-ebook.c
@@ -143,13 +143,12 @@ static int ebook_switch_add(struct acpi_device *device)
 	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 = {