[RFC] Deferred disk spinup during system resume

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Hello,

When resuming from system suspend, scsi disks are being spun up which
takes quite a lot of time (5+ seconds in my case). The spinup is done
synchronously, so this time adds up to overall system resume time.
Ours is an embedded platform and we are using flash-based rootfs, so
there is no immediate need in harddrive after resume. What is much
more important for us is to minimize time-to-full-power. To speed up
resume, we would like to have an option to defer the spinup or run it
in parallel with system resume. I could not find any existing
mechanism to do the trick, but I might have missed something.

Can anybody comment on this?

Thanks,
Maksim.
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