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, 2 insertions, 3 deletions

diff --git a/drivers/hwmon/acpi_power_meter.c b/drivers/hwmon/acpi_power_meter.c
index 0962c12eba5a..fa28d447f0df 100644
--- a/drivers/hwmon/acpi_power_meter.c
+++ b/drivers/hwmon/acpi_power_meter.c
@@ -910,12 +910,12 @@ exit:
 	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);
@@ -924,7 +924,6 @@ static int acpi_power_meter_remove(struct acpi_device *device)
 	free_capabilities(resource);
 
 	kfree(resource);
-	return 0;
 }
 
 static int acpi_power_meter_resume(struct device *dev)