diff options
| author | Yinghai Lu <yinghai.lu@oracle.com> | 2012-01-30 12:25:24 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-02-29 16:30:51 -0800 |
| commit | 608951f12d572bd36c95a5629a9c5bb7b6cf244c (patch) | |
| tree | db09c165e8b4ab781e62f9cbfb640e0bafea32b8 /drivers/pci | |
| parent | 74d54f57ce5ae36b8e74cab2a349edb614f1b5cb (diff) | |
PCI: workaround hard-wired bus number V2
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>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | 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 04e74f48571..dfee1b36b66 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)) { |