[autosuspend] [ums] spin down the disk in the suspend() method of the storage driver

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i use "040d:6204 VIA Technologies, Inc."  ( USB->IDE Adapter) with 2,5
hard drive what working perfectly except small issue with autosuspend.
It can be suspended and resumed, so it seems like there is no problem
power mangment in this adapter. But the way haw it will be suspended
make me some worries: the adpater will be just powered off and hard
drive make sound like air plain crash. Similar sound i heard on shutdown
 of my laptop with broken libata or acpi, so far i know it is not really
healthy for hard drive.

I think it should be done with some scenario like: 1. park heads, 2.
spin down, 3. suspend the adapter.

MfG
Alexey Fisher
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