Re: [linux-usb-devel] Re: OHCI problems with suspend/resume

[Pavel Machek <pavel@suse.cz>]

Hi!

> >>USB drivers don't talk suspend/resume yet, so they
> >>won't notice missing features there.  Regressions
> >>are a different story though.
> >>
> >>But I can imagine that usb-storage (or is that SCSI?)
> >>might want to veto suspending devices that are being
> >>used for some kinds of i/o.  Eventually it should exist.
> >
> >
> >For what kind of I/O? I do not see a reason for disk to veto
> >suspend. CD-burner might want to do that, but it still would be bad
> >idea... (Running on battery, battery goes low, and you destroy your CD
> >*and* your filesystem.
> 
> If it's in the middle of any kind of write, suspending would
> seem to be unwise.  Say, writing to a swap partition...

We already know it is not... We stopped all user tasks for this
purpose. Also the device has opportunity to simply wait inside
SAVE_STATE for a write to finish.

> Mostly I'm just saying that if vetoing ever makes sense
> (and I understand that it does), USB drivers will need
> to understand it too.

Agreed.
							Pavel

-- 
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]