ARM/PCI: Set MPS before pci_bus_add_devices()

The MPS configuration should be done *before* pci_bus_add_devices().  After
pci_bus_add_devices(), drivers may be bound to devices, and the PCI core
shouldn't touch device configuration while a driver owns the device.

[bhelgaas: remove check for bus being non-NULL]
Reported-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

arch/arm/kernel/bios32.c

@@ -521,6 +521,8 @@ void pci_common_init_dev(struct device *parent, struct hw_pci *hw)
 		struct pci_bus *bus = sys->bus;
 
 		if (!pci_has_flag(PCI_PROBE_ONLY)) {
+			struct pci_bus *child;
+
 			/*
 			 * Size the bridge windows.
 			 */
@@ -530,25 +532,15 @@ void pci_common_init_dev(struct device *parent, struct hw_pci *hw)
 			 * Assign resources.
 			 */
 			pci_bus_assign_resources(bus);
-		}
 
+			list_for_each_entry(child, &bus->children, node)
+				pcie_bus_configure_settings(child);
+		}
 		/*
 		 * Tell drivers about devices found.
 		 */
 		pci_bus_add_devices(bus);
 	}
-
-	list_for_each_entry(sys, &head, node) {
-		struct pci_bus *bus = sys->bus;
-
-		/* Configure PCI Express settings */
-		if (bus && !pci_has_flag(PCI_PROBE_ONLY)) {
-			struct pci_bus *child;
-
-			list_for_each_entry(child, &bus->children, node)
-				pcie_bus_configure_settings(child);
-		}
-	}
 }
 
 #ifndef CONFIG_PCI_HOST_ITE8152