hot-addacpi-hotplug-decouple-slot-power-state-changes-from-physical-hotplug.patch

[Paul Ionescu]

--- Rajesh Shah <rajesh.shah@xxxxxxxxx> wrote:

> > Is p2p hotplug in your roadmap (for i386) ?
>
> I believe others are already working on it. I expect to free up
> a bit more in a couple of weeks.  If I don't see any patches or
> indication of activity by then, I'll work on adding this support
> too.
> 
> Rajesh

Hi Rajesh,

While waiting for a p2p bridge hotplug support, I give a try to linux-2.6.12rc2-mm3 which include
your patch for powering on and off an ACPIPHP controlled PCI slot without actually remove the pci
card.
I gave it a try on my IBM thinkpad booted in docking station which has an ACPIPHP slot.

An echo 0 > /sys/bus/pci/slots/SOME_NUMBER/power is removing some devices ( verified with cat
/proc/pci ), but gives some kernel errors on console.
An echo 1 > /sys/bus/pci/slots/SOME_NUMBER/power is not activating the devices again ( again
tested with cat /proc/pci) but gives some kernel errors on console + some cpu registers and a
segfault.

In my dock I have a ide controller, 2 yenta pcmcia slots, and a PCI slot where I have a bttv
supported tv card.
All drivers needed were compiled in kernel, no modules needed.

Was this setup supposed to work ?
I can provide more info if needed.

Thanks,
Paul






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