PCI PM: Restore config spaces of all devices during early resume

At present the configuration spaces of PCI devices that have no
drivers or no PM support in the drivers (either legacy or through a
pm object) are not saved during suspend and, consequently, they are
not restored during resume. This generally may lead to the state of
the system being slightly inconsistent after the resume, so it's
better to save and restore the configuration spaces of these devices
as well.

Signed-off-by: Rafael J. Wysocki <[e-mail]>
Acked-by: Ingo Molnar <[e-mail]>
Acked-by: Jesse Barnes <[e-mail]>

drivers/pci/pci-driver.c

···
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_suspend(dev, PMSG_SUSPEND);
 
+	pci_dev->state_saved = false;
+
 	if (!pm) {
 		pci_pm_default_suspend(pci_dev);
 		goto Fixup;
 	}
-
-	pci_dev->state_saved = false;
 
 	if (pm->suspend) {
 		pci_power_t prev = pci_dev->current_state;
···
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
 
-	if (!pm)
+	if (!pm) {
+		pci_save_state(pci_dev);
 		return 0;
+	}
 
 	if (pm->suspend_noirq) {
 		pci_power_t prev = pci_dev->current_state;
···
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_suspend(dev, PMSG_FREEZE);
 
+	pci_dev->state_saved = false;
+
 	if (!pm) {
 		pci_pm_default_suspend(pci_dev);
 		return 0;
 	}
-
-	pci_dev->state_saved = false;
 
 	if (pm->freeze) {
 		int error;
···
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_suspend(dev, PMSG_HIBERNATE);
 
+	pci_dev->state_saved = false;
+
 	if (!pm) {
 		pci_pm_default_suspend(pci_dev);
 		goto Fixup;
 	}
-
-	pci_dev->state_saved = false;
 
 	if (pm->poweroff) {
 		int error;