linux-kernel - [PATCH v1 5/7] surface: surface3_power: Use ACPI

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Date:   Tue, 12 Oct 2021 19:46:47 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux ACPI <linux-acpi@...r.kernel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <mgross@...ux.intel.com>,
        Maximilian Luz <luzmaximilian@...il.com>,
        platform-driver-x86@...r.kernel.org
Subject: [PATCH v1 5/7] surface: surface3_power: Use ACPI_COMPANION() directly

From: Rafael J. Wysocki <rafael@...nel.org>

The ACPI_HANDLE() macro is a wrapper arond the ACPI_COMPANION()
macro and the ACPI handle produced by the former comes from the
ACPI device object produced by the latter, so it is way more
straightforward to evaluate the latter directly instead of passing
the handle produced by the former to acpi_bus_get_device().

Modify mshw0011_notify() accordingly (no intentional functional
impact).

Signed-off-by: Rafael J. Wysocki <rafael@...nel.org>
---
 drivers/platform/surface/surface3_power.c |    9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

Index: linux-pm/drivers/platform/surface/surface3_power.c
===================================================================
--- linux-pm.orig/drivers/platform/surface/surface3_power.c
+++ linux-pm/drivers/platform/surface/surface3_power.c
@@ -160,15 +160,14 @@ mshw0011_notify(struct mshw0011_data *cd
 {
 	union acpi_object *obj;
 	struct acpi_device *adev;
-	acpi_handle handle;
 	unsigned int i;
 
-	handle = ACPI_HANDLE(&cdata->adp1->dev);
-	if (!handle || acpi_bus_get_device(handle, &adev))
+	adev = ACPI_COMPANION(&cdata->adp1->dev);
+	if (!adev)
 		return -ENODEV;
 
-	obj = acpi_evaluate_dsm_typed(handle, &mshw0011_guid, arg1, arg2, NULL,
-				      ACPI_TYPE_BUFFER);
+	obj = acpi_evaluate_dsm_typed(adev->handle, &mshw0011_guid, arg1, arg2,
+				      NULL, ACPI_TYPE_BUFFER);
 	if (!obj) {
 		dev_err(&cdata->adp1->dev, "device _DSM execution failed\n");
 		return -ENODEV;