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    SubjectRe: [PATCH] PCI: Add pci shutdown ability
    On Mon, Apr 25, 2005 at 03:23:09PM -0400, Jeff Garzik wrote:
    > Greg KH wrote:
    > >Well it seems that people are starting to want to hook the reboot
    > >notifier, or the device shutdown facility in order to properly shutdown
    > >pci drivers to make kexec work nicer.
    > >
    > >So here's a patch for the PCI core that allows pci drivers to now just
    > >add a "shutdown" notifier function that will be called when the system
    > >is being shutdown. It happens just after the reboot notifier happens,
    > >and it should happen in the proper device tree order, so everyone should
    > >be happy.
    > >
    > >Any objections to this patch?
    > Traditionally the proper place -has- been
    > * the reboot notifier
    > * the ->remove hook (hot unplug, and module remove)
    > which covers all the cases.
    > Add a ->shutdown hook is more of a hack. If you want to introduce this
    > facility in a systematic way, introduce a 'kexec reboot' option which
    > walks the device tree and shuts down hardware.
    > ->shutdown is just a piecemeal, uncoordinated effort (uncoordinated in
    > the sense that driver shutdowns occur in an undefined order).
    > Jeff

    I agree, though I think "->remove" may be more than we need. Another
    potential use of this might be to prepare devices just before removing power.

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