[PATCH v4 5/5] PCI: generic: Pass proper starting bus number to pci_scan_root_bus().

David Daney ddaney.cavm at gmail.com
Fri Oct 2 11:44:03 PDT 2015

From: David Daney <david.daney at cavium.com>

If the bus is being configured with a bus-range that does not start at
zero, pass that starting bus number to pci_scan_root_bus().  Passing
the incorrect value of zero causes attempted config accesses outside
of the supported range, which cascades to an OOPs spew and eventual
kernel panic.

Acked-by: Will Deacon <will.deacon at arm.com>
Signed-off-by: David Daney <david.daney at cavium.com>
No change from v3.

 drivers/pci/host/pci-host-generic.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c
index 5cce837..eb4b7c7 100644
--- a/drivers/pci/host/pci-host-generic.c
+++ b/drivers/pci/host/pci-host-generic.c
@@ -264,7 +264,8 @@ static int gen_pci_probe(struct platform_device *pdev)
 	if (!pci_has_flag(PCI_PROBE_ONLY))
-	bus = pci_scan_root_bus(dev, 0,
+	bus = pci_scan_root_bus(dev, pci->cfg.bus_range->start,
 				&pci->cfg.ops->ops, pci, &pci->resources);
 	if (!bus) {
 		dev_err(dev, "Scanning rootbus failed");

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