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    Subject[ 05/72] PCI: workaround hard-wired bus number V2
    3.2-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Yinghai Lu <yinghai.lu@oracle.com>

    commit 71f6bd4a23130cd2f4b036010c5790b1295290b9 upstream.

    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.

    Tested-by: garyhade@us.ibm.com
    Signed-off-by: Yinghai Lu <yinghai.lu@oracle.com>
    Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/pci/probe.c | 5 +++++
    1 file changed, 5 insertions(+)

    --- a/drivers/pci/probe.c
    +++ b/drivers/pci/probe.c
    @@ -651,6 +651,11 @@ int __devinit pci_scan_bridge(struct pci
    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)) {



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