[PATCH v1 1/3] hwmon: (acpi_power_meter) Drop redundant checks from three functions

["Rafael J. Wysocki" <rafael@kernel.org>]

From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>

Since acpi_power_meter_notify() and acpi_power_meter_remove() are
.notify() and .remove() callback functions of an ACPI driver,
respectively, the first argument of the former and the only argument
of the latter cannot be NULL.  Likewise, the acpi_power_meter_resume()
argument cannot be NULL because it is a system resume callback
function.

Moreover, since all of these functions can only run after
acpi_power_meter_add() has returned 0, the driver_data field in the
struct acpi_device object used by them cannot be NULL either.

Accordingly, drop the redundant "device" checks against NULL from
acpi_power_meter_notify() and acpi_power_meter_remove(), drop the
redundant "dev" check against NULL from acpi_power_meter_resume(),
and drop the redundant acpi_driver_data() checks against NULL from
all of these functions.

Additionally, combine the initialization of the "resource" local
variable in acpi_power_meter_notify() and acpi_power_meter_remove()
with its declaration.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/hwmon/acpi_power_meter.c | 18 ++----------------
 1 file changed, 2 insertions(+), 16 deletions(-)

diff --git a/drivers/hwmon/acpi_power_meter.c b/drivers/hwmon/acpi_power_meter.c
index 1e3fab5f7946..49e57c20ef70 100644
--- a/drivers/hwmon/acpi_power_meter.c
+++ b/drivers/hwmon/acpi_power_meter.c
@@ -816,14 +816,9 @@ static int read_capabilities(struct acpi_power_meter_resource *resource)
 /* Handle ACPI event notifications */
 static void acpi_power_meter_notify(struct acpi_device *device, u32 event)
 {
-	struct acpi_power_meter_resource *resource;
+	struct acpi_power_meter_resource *resource = acpi_driver_data(device);
 	int res;
 
-	if (!device || !acpi_driver_data(device))
-		return;
-
-	resource = acpi_driver_data(device);
-
 	guard(mutex)(&acpi_notify_lock);
 
 	switch (event) {
@@ -956,12 +951,8 @@ static int acpi_power_meter_add(struct acpi_device *device)
 
 static void acpi_power_meter_remove(struct acpi_device *device)
 {
-	struct acpi_power_meter_resource *resource;
+	struct acpi_power_meter_resource *resource = acpi_driver_data(device);
 
-	if (!device || !acpi_driver_data(device))
-		return;
-
-	resource = acpi_driver_data(device);
 	if (!IS_ERR(resource->hwmon_dev))
 		hwmon_device_unregister(resource->hwmon_dev);
 
@@ -975,12 +966,7 @@ static int acpi_power_meter_resume(struct device *dev)
 {
 	struct acpi_power_meter_resource *resource;
 
-	if (!dev)
-		return -EINVAL;
-
 	resource = acpi_driver_data(to_acpi_device(dev));
-	if (!resource)
-		return -EINVAL;
 
 	free_capabilities(resource);
 	read_capabilities(resource);
-- 
2.51.0