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    SubjectRe: [PATCH] clockevents: Fix suspend/resume to disk hangs
    Date
    On Saturday, 17 March 2007 11:07, Thomas Meyer wrote:
    > Thomas Gleixner schrieb:
    > > I finally found a dual core box, which survives suspend/resume without
    > > crashing in the middle of nowhere. Sigh, I never figured out from the
    > > code and the bug reports what's going on.
    > >
    > > The observed hangs are caused by a stale state transition of the clock
    > > event devices, which keeps the RCU synchronization away from completion,
    > > when the non boot CPU is brought back up.
    > >
    > > The suspend/resume in oneshot mode needs the similar care as the
    > > periodic mode during suspend to RAM. My assumption that the state
    > > transitions during the different shutdown/bringups of s2disk would go
    > > through the periodic boot phase and then switch over to highres resp.
    > > nohz mode were simply wrong.
    > >
    > > Add the appropriate suspend / resume handling for the non periodic
    > > modes.
    > >
    > > Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    > >
    >
    > Excellent work. Now suspend to disk is working again. But:
    >
    > 1.) The quirk added in commit a417a21e10831bca695b4ba9c74f4ddf5a95ac06
    > for the appletouch driver doesn't seem to work after resume.
    >
    > 2.) The first suspend to disk works with no problems, but the second
    > suspend to disk in a row results in an oops:
    > ->resume_device ->
    > pci_device_resume->ata_host_resume->ahci_pci_device_resume->ata_pci_device_do_resume->pci_restore_state

    Can you please see if this problem is already in the Adrian's list of known
    regressions?

    Thanks,
    Rafael
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