1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 79be37a53397..00ba6a03dca5 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -264,8 +264,10 @@ void __devinit pci_read_bridge_bases(struct pci_bus *child)
 
         if (base <= limit) {
                 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
-                res->start = base;
-                res->end = limit + 0xfff;
+                if (!res->start)
+                        res->start = base;
+                if (!res->end)
+                        res->end = limit + 0xfff;
         }
 
         res = child->resource[1];