On Mon, Jan 30, 2012 at 7:35 AM, Bjorn Helgaas [off-list ref] wrote:

On Fri, Jan 27, 2012 at 6:49 PM, Yinghai Lu [off-list ref] wrote:

quoted

update pci_scan_root_bus, and pci_scan_bus to insert root bus busn into
iobusn_resource tree.
-struct pci_bus * __devinit pci_scan_root_bus(struct device *parent, int bus,
-               struct pci_ops *ops, void *sysdata, struct list_head *resources)
+struct pci_bus * __devinit pci_scan_root_bus_max(struct device *parent, int bus,
+               int bus_max, struct pci_ops *ops, void *sysdata,
+               struct list_head *resources)

We are adding "scan root bus" interfaces at an alarming rate (I'm
responsible for most of them, so I'm not blaming you :)).  Could we
get away without adding this one by just adding a bus number resource
to the "resources" list?  For example, then an arch could do:

   LIST_HEAD(resources);
   pci_add_resource(resources, bus_window);
   pci_add_resource(resources, mem_window);
   pci_add_resource(resources, io_window);
   pci_scan_root_bus(..., resources);

If pci_scan_root_bus() didn't find a bus number resource in the list,
it could fall back to a default max_bus of 255.

this pci_scan_root_bus_max is only used for x86 code.  and should be
fixed later.

Yinghai