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

1 files changed, 1 insertions, 3 deletions

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[] = {