Am Freitag, 9. Februar 2007 19:06 schrieb Alan Stern:
> On Fri, 9 Feb 2007, Oliver Neukum wrote:
>
> > Hi,
> >
> > here's autosuspend for storage devices. It was surprisingly easy.
> > I've tested it and I can play an mp3 and see how the stick wakes
> > up every few seconds. Comments?
> > To test this you'll likely have to turn off haldaemon. This still
> > needs a solution.
>
> The patch isn't really right. For one thing, you removed some mutexes
> that are necessary (don't forget that suspend can come from sources other
> than autosuspend).
Yes, I am currently finding out what is to guard against.
This was not the final version, just a friday publish before
dinner thing. I'll be more explicit next time.
> Also, it's debatable whether USB should autosuspend a storage device at
> all. Like with HID devices, it seems more logical to have autosuspend
> requests come up from the lower layer (in this case the SCSI layer).
> After all, suspending a disk could cause it to spin down, which is
> something the SCSI disk driver might want to be aware of. You could raise
> this question on the linux-scsi mailing list.
I will. But which devices don't have an upper layer. And strictly
speaking I am not suspending devices. I am managing vetos.
Regards
Oliver
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