@@ -489,6 +489,17 @@ static void of_scan_pci_bridge(struct pci_pbm_info *pbm,
size = GET_64BIT(ranges, 6);
if (flags == 0 || size == 0)
continue;
+
+ /* On PCI-Express systems, PCI bridges that have no devices downstream
+ * have a bogus size value where the first 32-bit cell is 0xffffffff.
+ * This results in a bogus range where start + size overflows.
+ *
+ * Just skip these otherwise the kernel will complain when the resource
+ * tries to be claimed.
+ */
+ if (size >> 32 == 0xffffffff)
+ continue;
+
if (flags & IORESOURCE_IO) {
res = bus->resource[0];
if (res->flags) {
It seems that when a PCI Express bridge is not in use and has no devices behind it, the ranges property is bogus. Specifically the size property is of the form [0xffffffff:...], and if you add this size to the resource start address the 64-bit calculation will overflow. Just check specifically for this size value signature and skip them. Signed-off-by: David S. Miller <davem@davemloft.net> --- arch/sparc/kernel/pci.c | 11 +++++++++++ 1 file changed, 11 insertions(+)