Re: [ACPI] Hotplug PCI bridges

[Matthew W. <wi...@de...>]

On Mon, Mar 24, 2003 at 02:58:06PM +0900, Takayoshi Kochi wrote:
> > So.. how to fix?  Well, it depends.  Right now we have a half-arsed belief
> > that PCI root bridges can go away.  Either we need to stop believing it
> > or believe it properly.
> 
> Yes, they can.

OK.  In that case the existing code was broken as there was no way for
the acpiphp driver to be informed when the root bridge was removed.

> > If we believe it, we need to have some mechanism for having two drivers
> > for one device [1].  This doesn't need to be a generic mechanism; it's
> > fairly clear that acpiphp is a `subdriver' of pci_root and will always
> > be initialised after it.
> 
> For 2.4, there is no acpi_bus_register_driver in the stock kernel
> and we have luckily avoided the problem...

Well, yeah.  But I need the GPE Block support in the latest version of ACPI,
so I have to upgrade my ACPI CA.

> > I'm currently favouring an acpi_pci_{,un}register_driver() interface with
> > add and remove callbacks, since it's the least amount of code change
> > without disbelieving pci root bridge removal.
> 
> I have no objection for going for it.

OK.  Will implement today.

-- 
"It's not Hollywood.  War is real, war is primarily not about defeat or
victory, it is about death.  I've seen thousands and thousands of dead bodies.
Do you think I want to have an academic debate on this subject?" -- Robert Fisk