On Mon, 15 Oct 2007, Greg KH wrote:
On Mon, Oct 15, 2007 at 10:04:01PM -0600, Matthew Wilcox wrote:
On Mon, Oct 15, 2007 at 07:54:22PM -0700, david@xxxxxxx wrote:
do PCI devices reorder their bus numbers spontaniously, or only if you
change the hardware?
The only system I've had that reordered PCI bus numbers was when I had a
partitionable system and changed the partitioning. Not quite "change
the hardware", but neither was it "spontaneous". It was certainly
unexpected (for me).
Greg probably has quite different examples.
Changing the hardware (adding a new PCI device or removing one) are the
most common times this happens. But I have seen reports of this
happening when you upgrade/downgrade BIOS versions, and, in some
oops-we-messed-up cases, when we changed things in the kernel.
BIOS upgrades qualify as changing hardware (or close to it)
oops-we-messed-up cases of kernel changes don't justify 'best effort'
nameing, it's a regression that needs to be fixed.
now the other example given of docking a laptop is closer to reasonable
(and is definantly a reason to have 'best effort' nameing as an option),
but that's still a relativly special case, and it _is_ definantly
changeing the hardware
David Lang
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