PCI PM: Simplify PCI wake-up code

Rework the PCI wake-up code so that it's easier to read without
changing the functionality.

Reviewed-by: Matthew Garrett <mjg59@srcf.ucam.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 7 insertions, 3 deletions

diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index ea15b0537457..e798c4736a66 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -111,12 +111,16 @@ static bool acpi_pci_can_wakeup(struct pci_dev *dev)
 
 static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
 {
-        int error = acpi_pm_device_sleep_wake(&dev->dev, enable);
+        int error;
 
+        if (!acpi_pci_can_wakeup(dev))
+                return 0;
+
+        error = acpi_pm_device_sleep_wake(&dev->dev, enable);
         if (!error)
-                dev_printk(KERN_INFO, &dev->dev,
-                                "wake-up capability %s by ACPI\n",
+                dev_info(&dev->dev, "wake-up capability %s by ACPI\n",
                                 enable ? "enabled" : "disabled");
+
         return error;
 }