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    SubjectRe: [linux-pm] Re: Hibernation considerations
    Am Freitag 20 Juli 2007 schrieb Alan Stern:
    > On Fri, 20 Jul 2007, Oliver Neukum wrote:
    > > Am Freitag 20 Juli 2007 schrieb Alan Stern:
    > > > Some drivers need the ability to schedule.  Some will need the ability
    > > > to allocate memory (although GFP_ATOMIC is probably sufficient).  Some
    > > > will need timers to run.
    > >
    > > Some will have to request firmware. It can add up to some megabytes.
    > > In addition, if we don't freeze, some drivers, eg. video drivers, can
    > > do allocations in the megabyte range.
    > >
    > > It seems to me that without the freezer we will end up with many drivers
    > > needing a two step notification process. Furthermore there are requirements
    > > on the order of shutting down system facilities, eg. device addition must
    > > be stopped before drivers allocate firmware.
    > These are really separate issues, since they refer to things that have
    > to happen well before the memory snapshot is captured.
    > We already have a pre-suspend notification available for drivers that
    > need to allocate large amounts of memory.

    Is that facility fine grained enough?

    > You are correct about the need to delay/stop device addition. I don't
    > know how this can be done in general; each code path calling
    > device_add() may have to be treated individually.

    What about the old API? Do we have to block module loading?
    What happens if a scsi error handler is woken? If it cannot be woken,
    how are errors handled?

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