commit: 71f6bd4a23130cd2f4b036010c5790b1295290b9 From: Yinghai Lu <[email protected]> Date: Mon, 30 Jan 2012 12:25:24 +0100 Subject: 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: [email protected] Tested-by: [email protected] Signed-off-by: Yinghai Lu <[email protected]> Signed-off-by: Jesse Barnes <[email protected]> --- drivers/pci/probe.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 7cc9e2f..71eac9c 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -651,6 +651,11 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n", secondary, subordinate, pass); + if (!primary && (primary != bus->number) && secondary && subordinate) { + dev_warn(&dev->dev, "Primary bus is hard wired to 0\n"); + primary = bus->number; + } + /* Check if setup is sensible at all */ if (!pass && (primary != bus->number || secondary <= bus->number)) { -- 1.7.3.4 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
