I think your are doing the right thing too since it seems much cleaner
to get back in the initial state after the interface has been released,
actually we had to face the same problem for the eciadsl driver. The
thing is we should never had done code assuming interface would state in
it's last state... So i think it's a pretty good thing and it's easy to
work this through in a userspace driver.
Le mar 06/01/2004 à 17:36, Alan Stern a écrit :
> On Mon, 5 Jan 2004, Duncan Sands wrote:
>
> > Well done! However one could say that the problem is in modem_run.
> > The problem is that modem_run sets altsetting 1 on interface 1 then
> > exits. pppoax expects to see that altsetting. But when modem_run
> > exits it releases interface 1 which returns interface 1 to altsetting 0
> > (thanks to a change by Alan Stern (IIRC)). Then pppoax is run.
> > It needs altsetting 1 to work. I think the right solution is for pppoax
> > to set altsetting 1 on interface 1 itself. Just remove the test
> > if (alternate_ep != -1) {
> > in pppoa3.c, line 680 (untested).
> >
> > Alan, what do you think? Is choosing altsetting 0 in usb_driver_release_interface
> > appropriate given that there are user space drivers around?
>
> I think we're doing the right thing. A user space driver shouldn't
> assume, when it rebinds an interface, that the interface is still in the
> same state as when it was unbound earlier. After all, another user space
> driver might have interfered in the meantime. The only reasonable
> assumption is that the interface is in its default altsetting 0 state,
> which is what we do.
>
> Alan Stern
>
>
>
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