On Thu, 8 Feb 2007, Oliver Neukum wrote:

> > Taken to its logical conclusion, your argument says that the inactivity
> > delay shouldn't be set at the USB layer at all -- it should be set at the
> > input layer and propagated up somehow.
> 
> Indeed. Now we could again debate whether autosuspend belongs into
> USB at all.

Well, it certainly belongs there for devices without drivers and for
devices that don't have logical children.

> [..]
> >     autosuspend_delay > 0 && test_and_clear_bit(DEVICE_BUSY, ...) == 0
> > 
> > where autosuspend_delay <= 0 means the user wants the interface never to
> > be autosuspended.  If any of the test_and_clear_bit() checks fail, you
> > want the routine to set the next timeout to the maximum of the
> > corresponding autosuspend_delay values.
> 
> Yes.
>  
> > All this in addition to the standard device-wide autosuspend delay, which
> > will also be settable via sysfs.  The initial timeout value should be set 
> > to the maximum of the device-wide delay and the interface delays.
> > 
> > Is that right?
> 
> Yes.

Okay, I'll work on it.

Alan Stern


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