PCI/PM: Do not restore BARs if device is not in D0

Do not attempt to restore the device's BARs in
pci_set_full_power_state() if the actual current
power state of the device is not D0.

Link: https://lore.kernel.org/r/1849718.CQOukoFCf9@kreacherSigned-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/pci.c

@@ -1273,10 +1273,10 @@ static int pci_set_full_power_state(struct pci_dev *dev)
 
 	pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
 	dev->current_state = pmcsr & PCI_PM_CTRL_STATE_MASK;
-	if (dev->current_state != PCI_D0)
+	if (dev->current_state != PCI_D0) {
 		pci_info_ratelimited(dev, "Refused to change power state from %s to D0\n",
 				     pci_power_name(dev->current_state));
-
+	} else if (ret > 0) {
 		/*
 		 * According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT
 		 * INTERFACE SPECIFICATION, REV. 1.2", a device transitioning
@@ -1290,8 +1290,8 @@ static int pci_set_full_power_state(struct pci_dev *dev)
 		 * restore at least the BARs so that the device will be
 		 * accessible to its driver.
 		 */
-	if (ret > 0)
 		pci_restore_bars(dev);
+	}
 
 	if (dev->bus->self)
 		pcie_aspm_pm_state_change(dev->bus->self);