[PATCH] Change the PCI bus driver to free resources leaked by drivers

Currently our driver model trusts drivers to DTRT and properly release any 
resources they allocated during probe() and attach().  I've added a new
resource_list() helper method to release active resources on a resource
list and used this to write a pci_child_detached() which cleans up any
active resources when a device fails to probe or a driver finishes
detach.  It also fixes an issue where we did not power down devices when
the driver was detached (e.g. via kldunload).  I've tested the resource
bits by writing a dummy driver that intentionally attached to an unattached
device and leaked a memory BAR and verified that the bus warned about the
leak and cleaned it up.

http://www.FreeBSD.org/~jhb/patches/pci_clean_detach.patch

-- 
John Baldwin
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