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| author | David S. Miller <davem@davemloft.net> | 2014-08-12 23:27:01 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-08-13 21:17:49 -0700 |
| commit | 4afba24e5fc2626a3c604ec990539572f6662ff9 (patch) | |
| tree | 9747dae7206d7aa396ece4c22397d81ba848eba5 | |
| parent | 93a6423bd84d977bd768a001c6c3868e6a20b63a (diff) | |
| download | linux-4afba24e5fc2626a3c604ec990539572f6662ff9.tar.gz linux-4afba24e5fc2626a3c604ec990539572f6662ff9.tar.bz2 linux-4afba24e5fc2626a3c604ec990539572f6662ff9.zip | |
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 <davem@davemloft.net>
| -rw-r--r-- | arch/sparc/kernel/pci.c | 11 |
1 files changed, 11 insertions, 0 deletions
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) { |