PCI/PM: Make pci_pme_active() ignore devices without PME support

Make pci_pme_active() ignore devices without PME support, so that
it doesn't print the "PME enabled" or "PME disabled" debug messages
for devices that don't support PME.

So that pci_pme_active() doesn't have to check pm_cap in addition
to pme_support, make pci_pm_init() clear pme_support upfront to
make sure that it will be 0 for pm_cap equal to 0.
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>

drivers/pci/pci.c

@@ -1571,7 +1571,7 @@ void pci_pme_active(struct pci_dev *dev, bool enable)
 {
 	u16 pmcsr;
 
-	if (!dev->pm_cap)
+	if (!dev->pme_support)
 		return;
 
 	pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
@@ -1920,6 +1920,7 @@ void pci_pm_init(struct pci_dev *dev)
 	dev->wakeup_prepared = false;
 
 	dev->pm_cap = 0;
+	dev->pme_support = 0;
 
 	/* find PCI PM capability in list */
 	pm = pci_find_capability(dev, PCI_CAP_ID_PM);
@@ -1971,8 +1972,6 @@ void pci_pm_init(struct pci_dev *dev)
 		device_set_wakeup_capable(&dev->dev, true);
 		/* Disable the PME# generation functionality */
 		pci_pme_active(dev, false);
-	} else {
-		dev->pme_support = 0;
 	}
 }