Re: [RFD] Automatic suspend

Rafael J. Wysocki
2009-02-16T23:00:41Z

On Monday 16 February 2009, Pavel Machek wrote:
> Hi!
>
> > > Userland should never ever control the state of a device like this
> > > directly. It should do so by a) closing the device and b) setting
> > > latency / functional requirements.
> >
> > The user, however, may want to forcibly put a device into a low power state
> > without stopping all of the applications that depend on it (eg. have it open).
> > Do you think that we shouldn't allow users to do such things?
>
> I don't think we should do this... of you want device to be powered
> down, just don't keep it open. revoke should be enough :-).
>
> ...one execption here is the disk driver; unmounting filesystems to
> let the disk spin down is probably too heavy.

Well, I don't think it's viable to make any exceptions here. Either we do it
or we don't. And the agreement appears to be that we don't.

Thanks,
Rafael