[PATCH 2.6.23] ibmebus: Prevent bus_id collisions

[Nathan Lynch]

Hi-

Joachim Fenkes wrote:
> Previously, ibmebus derived a device's bus_id from its location code. The
> location code is not guaranteed to be unique, so we might get bus_id
> collisions if two devices share the same location code. The OFDT full_name,
> however, is unique, so we use that instead.

This is a userspace-visible change, but I guess it's unavoidable.
Will anything break?

Also, I dislike this approach of duplicating the firmware device tree
path in sysfs.  Are GX/ibmebus devices guaranteed to be children of
the same node in the OF device tree?  If so, their unit addresses will
be unique, and therefore suitable values for bus_id.  I believe this
is what the powerpc vio bus code does.