From 4afba24e5fc2626a3c604ec990539572f6662ff9 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Tue, 12 Aug 2014 23:27:01 -0700 Subject: [PATCH] sparc64: Skip bogus PCI bridge ranges. 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 --- arch/sparc/kernel/pci.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/sparc/kernel/pci.c b/arch/sparc/kernel/pci.c index da24fb6deb03..cc4c31e5185e 100644 --- a/arch/sparc/kernel/pci.c +++ b/arch/sparc/kernel/pci.c @@ -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) { -- 2.30.2