Am Sonntag, 27. Juni 2004 21:50 schrieb David Brownell:
> Oliver Neukum wrote:
> >>>Isn't a driver that's not switching to altsetting 0 in its suspend() buggy?
> >>
> >>No. When the device resumes it will be in the same altsetting as it was
> >>when it suspended. The driver doesn't need to switch altsettings.
> >
> >
> > Then we must refuse any sleep states that want to power down the bus.
>
> No, if the bus powers off the call sequence seen by that driver
> will be suspend()->disconnect() rather than suspend()->resume().
This will do horrible things if the attached device has considerable state.
With usb-storage it will lead to data loss.
> That's a completely routine operation, like unplugging something
> while it's suspended. You want to tell folk they can't suspend
> their laptop and THEN unplug all devices/cables?
I don't want to, but apparently it is the case. See this thread:
Process in D state with USB and swsuspsp
Regards
Oliver
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