PCI: mvebu: Only remap I/O space if configured

If there is no PCI I/O aperture configured in the Device Tree, it does
not make sense to create the virtual mapping for the PCI I/O space,
since we will anyway not create the MBus window that will allow to
access it. Therefore, do the pci_ioremap_io() only if necessary.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

drivers/pci/controller/pci-mvebu.c

@@ -1220,6 +1220,9 @@ static int mvebu_pcie_probe(struct platform_device *pdev)
 		pcie->realio.end = min_t(resource_size_t,
 					 IO_SPACE_LIMIT,
 					 resource_size(&pcie->io) - 1);
+
+		for (i = 0; i < (IO_SPACE_LIMIT - SZ_64K); i += SZ_64K)
+			pci_ioremap_io(i, pcie->io.start + i);
 	} else
 		pcie->realio = pcie->io;
 
@@ -1278,9 +1281,6 @@ static int mvebu_pcie_probe(struct platform_device *pdev)
 
 	pcie->nports = i;
 
-	for (i = 0; i < (IO_SPACE_LIMIT - SZ_64K); i += SZ_64K)
-		pci_ioremap_io(i, pcie->io.start + i);
-
 	mvebu_pcie_enable(pcie);
 
 	return 0;