[POWERPC] Make pci_iounmap actually unmap things

This patch uses the newly added functions for testing if an address is
an ISA or PCI IO port to properly unmap things in pci_iounmap that
aren't such ports.  Without that, drivers using the iomap API will never
actually unmap resources, which on IBM server machines will prevent
hot-unplug of the corresponding HW adapters.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/iomap.c

@@ -7,6 +7,7 @@
 #include <linux/pci.h>
 #include <linux/mm.h>
 #include <asm/io.h>
+#include <asm/pci-bridge.h>
 
 /*
  * Here comes the ppc64 implementation of the IOMAP 
@@ -136,7 +137,12 @@ void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max)
 
 void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
 {
-	/* Nothing to do */
+	if (isa_vaddr_is_ioport(addr))
+		return;
+	if (pcibios_vaddr_is_ioport(addr))
+		return;
+	iounmap(addr);
 }
+
 EXPORT_SYMBOL(pci_iomap);
 EXPORT_SYMBOL(pci_iounmap);