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    SubjectRe: [PATCH 0/6] PM: Asynchronous suspend and resume of devices
    On Wed, 26 Aug 2009, Rafael J. Wysocki wrote:

    > Hi,
    >
    > The following patches introduce a mechanism allowing us to execute device
    > drivers' suspend and resume callbacks asynchronously during system sleep
    > transitions, such as suspend to RAM.
    >
    > The idea is explained in the changelogs of the first two patches.
    >
    > Comments welcome.

    I've been terribly busy and haven't had a chance to look at this. The
    earlier version seemed to have a bunch of mutual-exclusion issues; are
    they resolved now? There were also some problems involving unsafe
    iteration over the dpm_list -- remember that devices can be
    unregistered at any time, not just while they are suspending or
    resuming.

    When a device finishes, instead of having the async thread look for
    another device to work on, I think it would be better to have the
    thread check the dependents of the current device. Those which are
    now ready can be added to a "device-ready" list, which is used to
    direct the actions of new async threads.

    Alan Stern



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