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>

1 files changed, 3 insertions, 6 deletions

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)