Am Dienstag 18 September 2007 schrieb James Bottomley:
> On Tue, 2007-09-18 at 10:32 +0200, Oliver Neukum wrote:
> > which function should a lldd call to make the scsi layer flush
> > a device's buffers and spin it down? Which kind of locking is
> > required?
>
> Depends on the context. Is this for suspend? If so it's done
> automatically by the sd driver, but the device has to be marked for it
> in the manage_start_stop attributes.
It is for runtime power management. We've gotten a bug report about
a drive enclosure that doesn't properly park heads if the usb device is
simply suspended. Apparently it simply cuts power so the cache can
be lost, too.
Regards
Oliver
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