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    SubjectRe: [PATCH 0/23] reboot-fixes

    On Thu, 2005-07-28 at 08:54, Pavel Machek wrote:
    > Hi!
    > > > > Good question. I'm not certain if Pavel intended to add
    > > > > device_suspend(PMSG_FREEZE) to the reboot path. It was
    > > > > there in only one instance. Pavel comments talk only about
    > > > > the suspend path.
    > > >
    > > > Yes, I think we should do device_suspend(PMSG_FREEZE) in reboot path.
    > >
    > > Why?
    > Many bioses are broken; if you leave hardware active during reboot,
    > they'll hang during reboot. It is so common problem that I think that
    > only sane solution is make hardware quiet before reboot.

    Sorry for my slow reply.

    If I remember correctly PMSG_FREEZE was intended solely for stopping
    activity when suspend to disk implementations are about to do their
    atomic copies. I thought that ide reacts to this message by putting a
    hold on queues, but doesn't otherwise do anything to prepare a drive for
    a restart. If that's true, using FREEZE here isn't going to stop drives
    from doing their emergency shutdown actions. Don't we need PMSG_SUSPEND


    Enumerate the requirements.
    Consider the interdependencies.
    Calculate the probabilities.

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      Last update: 2005-08-04 05:27    [W:0.021 / U:1.352 seconds]
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