PCI: Check P2P bridge for invalid secondary/subordinate range
For bridges with "secondary > subordinate", i.e., invalid bus number apertures, we don't enumerate anything behind the bridge unless the user specified "pci=assign-busses". This patch makes us automatically try to reassign the downstream bus numbers in this case (just for that bridge, not for all bridges as "pci=assign-busses" does). We don't discover all the devices on the Intel DP43BF motherboard without this change (or "pci=assign-busses") because its BIOS configures a bridge as: pci 0000:00:1e.0: PCI bridge to [bus 20-08] (subtractive decode) [bhelgaas: changelog, change message to dev_info] Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=18412 Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=625754 Reported-by: Brian C. Huffman <bhuffman@graze.net> Reported-by: VL <vl.homutov@gmail.com> Tested-by: VL <vl.homutov@gmail.com> Signed-off-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Cc: stable@vger.kernel.org
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@ -729,8 +729,10 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max,
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/* Check if setup is sensible at all */
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if (!pass &&
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(primary != bus->number || secondary <= bus->number)) {
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dev_dbg(&dev->dev, "bus configuration invalid, reconfiguring\n");
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(primary != bus->number || secondary <= bus->number ||
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secondary > subordinate)) {
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dev_info(&dev->dev, "bridge configuration invalid ([bus %02x-%02x]), reconfiguring\n",
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secondary, subordinate);
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broken = 1;
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}
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