linux-kernel - [PATCH v2 5/7] surface: surface3_power: Drop redundant acpi_bus_get

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Message-ID: <2503491.Lt9SDvczpP@kreacher>
Date:   Tue, 12 Oct 2021 21:32:04 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux ACPI <linux-acpi@...r.kernel.org>,
        Maximilian Luz <luzmaximilian@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <mgross@...ux.intel.com>,
        platform-driver-x86@...r.kernel.org
Subject: [PATCH v2 5/7] surface: surface3_power: Drop redundant acpi_bus_get_device() call

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

If the ACPI companion of a given device is not present, the result
of the ACPI_HANDLE() evaluation for it will be NULL, so calling
acpi_bus_get_device() on ACPI_HANDLE() result in order to validate
it is redundant.

Drop the redundant acpi_bus_get_device() call from mshw0011_notify()
along with a local variable related to it.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael@...nel.org>
---

v1 -> v2:
   * Instead of switching over to using ACPI_COMPANION(), just drop the
     redundant acpi_bus_get_device() call from mshw0011_notify() and
     update the subject and changelog accordingly.

---
 drivers/platform/surface/surface3_power.c |    3 +--
 1 file changed, 1 insertion(+), 2 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
@@ -159,12 +159,11 @@ mshw0011_notify(struct mshw0011_data *cd
 		unsigned int *ret_value)
 {
 	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))
+	if (!handle)
 		return -ENODEV;
 
 	obj = acpi_evaluate_dsm_typed(handle, &mshw0011_guid, arg1, arg2, NULL,