PCI: workaround hard-wired bus number V2
Fixes PCI device detection on IBM xSeries IBM 3850 M2 / x3950 M2 when using ACPI resources (_CRS). This is default, a manual workaround (without this patch) would be pci=nocrs boot param. V2: Add dev_warn if the workaround is hit. This should reveal how common such setups are (via google) and point to possible problems if things are still not working as expected. -> Suggested by Jan Beulich. Cc: stable@vger.kernel.org Tested-by: garyhade@us.ibm.com Signed-off-by: Yinghai Lu <yinghai.lu@oracle.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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@ -651,6 +651,11 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max,
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dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n",
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secondary, subordinate, pass);
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if (!primary && (primary != bus->number) && secondary && subordinate) {
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dev_warn(&dev->dev, "Primary bus is hard wired to 0\n");
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primary = bus->number;
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}
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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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