[PATCH] ppc64: PCI ignores empty phb regions

The ppc64 PCI code, when parsing the OF tree, may end up getting empty
regions in addition to the "normal" ones for the PHB (some pSeries OF
device-tree contains weird "ranges" properties). These are harmless but
do trigger some annoying warnings during boot, so let's ignore them.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ppc64/kernel/pci.c

@@ -654,6 +654,8 @@ void __devinit pci_process_bridge_OF_ranges(struct pci_controller *hose,
 			cpu_phys_addr = cpu_phys_addr << 32 | ranges[4];
 
 		size = (unsigned long)ranges[na+3] << 32 | ranges[na+4];
+		if (size == 0)
+			continue;
 		switch ((ranges[0] >> 24) & 0x3) {
 		case 1:		/* I/O space */
 			hose->io_base_phys = cpu_phys_addr;