[POWERPC] Fix IO Window Updates on P2P bridges.

When update_bridge_base() updates the IO window on a PCI-to-PCI
bridge, it fails to zero the upper 16 bits of the base and limit
registers if the window size is less than 64K.  This fixes it.

Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/arch/powerpc/kernel/pci_32.c b/arch/powerpc/kernel/pci_32.c
index 9b49f86..0d9ff72 100644 (file)
--- a/arch/powerpc/kernel/pci_32.c
+++ b/arch/powerpc/kernel/pci_32.c
@@ -441,14 +441,14 @@ update_bridge_base(struct pci_bus *bus, int i)
                end = res->end - off;
                io_base_lo = (start >> 8) & PCI_IO_RANGE_MASK;
                io_limit_lo = (end >> 8) & PCI_IO_RANGE_MASK;
-               if (end > 0xffff) {
-                       pci_write_config_word(dev, PCI_IO_BASE_UPPER16,
-                                             start >> 16);
-                       pci_write_config_word(dev, PCI_IO_LIMIT_UPPER16,
-                                             end >> 16);
+               if (end > 0xffff)
                        io_base_lo |= PCI_IO_RANGE_TYPE_32;
-               } else
+               else
                        io_base_lo |= PCI_IO_RANGE_TYPE_16;
+               pci_write_config_word(dev, PCI_IO_BASE_UPPER16,
+                               start >> 16);
+               pci_write_config_word(dev, PCI_IO_LIMIT_UPPER16,
+                               end >> 16);
                pci_write_config_byte(dev, PCI_IO_BASE, io_base_lo);
                pci_write_config_byte(dev, PCI_IO_LIMIT, io_limit_lo);