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authorYinghai Lu <yinghai.lu@oracle.com>2012-01-30 12:25:24 +0100
committerJesse Barnes <jbarnes@virtuousgeek.org>2012-02-10 20:34:42 +0100
commit71f6bd4a23130cd2f4b036010c5790b1295290b9 (patch)
treefdd218f6102bea21de0a0c5663b4da0f1787a23e /drivers/pci
parentMerge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux (diff)
downloadlinux-71f6bd4a23130cd2f4b036010c5790b1295290b9.tar.xz
linux-71f6bd4a23130cd2f4b036010c5790b1295290b9.zip
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>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/probe.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 7cc9e2f0f47c..71eac9cd724d 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)) {