linux-kernel - [PATCH v1 5/5] PCI: PM: ACPI: Drop unnecessary acpi_pci_power

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Date:   Sat, 18 Sep 2021 15:27:37 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux ACPI <linux-acpi@...r.kernel.org>,
        Linux PCI <linux-pci@...r.kernel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        x86 Maintainers <x86@...nel.org>
Subject: [PATCH v1 5/5] PCI: PM: ACPI: Drop unnecessary acpi_pci_power_manageable() calls

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

Simplify acpi_pci_power_manageable() and drop two invocations of it
that are not necessary, because the functions called when it returns
'true' do the requisite "power manageable" checks themselves.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/pci/pci-acpi.c |    4 +---
 drivers/pci/pci.c      |   16 +++++-----------
 2 files changed, 6 insertions(+), 14 deletions(-)

Index: linux-pm/drivers/pci/pci.c
===================================================================
--- linux-pm.orig/drivers/pci/pci.c
+++ linux-pm/drivers/pci/pci.c
@@ -1128,9 +1128,7 @@ void pci_update_current_state(struct pci
  */
 void pci_refresh_power_state(struct pci_dev *dev)
 {
-	if (acpi_pci_power_manageable(dev))
-		acpi_pci_refresh_power_state(dev);
-
+	acpi_pci_refresh_power_state(dev);
 	pci_update_current_state(dev, dev->current_state);
 }
 
@@ -1143,14 +1141,10 @@ int pci_platform_power_transition(struct
 {
 	int error;
 
-	if (acpi_pci_power_manageable(dev)) {
-		error = acpi_pci_set_power_state(dev, state);
-		if (!error)
-			pci_update_current_state(dev, state);
-	} else
-		error = -ENODEV;
-
-	if (error && !dev->pm_cap) /* Fall back to PCI_D0 */
+	error = acpi_pci_set_power_state(dev, state);
+	if (!error)
+		pci_update_current_state(dev, state);
+	else if (!dev->pm_cap) /* Fall back to PCI_D0 */
 		dev->current_state = PCI_D0;
 
 	return error;
Index: linux-pm/drivers/pci/pci-acpi.c
===================================================================
--- linux-pm.orig/drivers/pci/pci-acpi.c
+++ linux-pm/drivers/pci/pci-acpi.c
@@ -969,9 +969,7 @@ bool acpi_pci_power_manageable(struct pc
 {
 	struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
 
-	if (!adev)
-		return false;
-	return acpi_device_power_manageable(adev);
+	return adev && acpi_device_power_manageable(adev);
 }
 
 bool acpi_pci_bridge_d3(struct pci_dev *dev)