One question about the useage of pci_dev->resource[]

[Richard Yang <weiyang@linux.vnet.ibm.com>]

All,

I want to confirm something for the pci_dev->resource[].

As in the definition in the pci.h, this resource array is divided into
several parts.
    0-5  for standard PCI resources
    6    for ROM resource
    7-10 for bridge resource( if no iov )


1. For P2P bridge, 0-5 is left empty?
2. If so, in code pci_setup_device(), I think it set the wrong resource.
   It call pci_read_bases(dev, 2, PCI_ROM_ADDRESS1), for a p2p bridge. 
   And in pci_read_bases(), BAR information is retrieved and set to
   pci_dev->resource[0|1].
3. If pci_setup_device() just set first two resource, the child bus will
   point to empty resource.
   In pci_alloc_child_bus(), child->resource[0-3] will be point to
   bridge->resource[7-10], which is not set in pci_setup_device().
4. Another question is, is there any convention for pci_bus->resource[].
   [0] for io, [1] for mem, [2] for prefetch?

-- 
Richard Yang
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