Re: [linux-usb-devel] Re: [OOPS, usbcore, releaseintf] 2.6.0-test10-mm1

[Oliver Neukum]

Am Freitag, 12. Dezember 2003 21:48 schrieb Alan Stern:
> On Fri, 12 Dec 2003, David Brownell wrote:
> 
> > Alan Stern wrote:
> > 
> > >>That would also reduce the length of time the address0_sem
> > >>is held,
> > > 
> > > 
> > > It would?  How so?
> > 
> > It would be dropped after the address is assigned (the bus
> > no longer has an "address zero") ... rather than waiting
> > until after the device was configured and all its interfaces
> > were probed.  I think that's the issue Oliver alluded to in
> > his followup to your comment.
> 
> I thought it did that already.  Oh well...

Not so simple. Khubd goes down a list. If the first item on its list
is not your failed reset, a deadlock will occur.

After you have submitted the URB that really does the reset, you
are commited. You must either set a valid address or disable the port.
You can rely on nobody else to do that.

	Regards
		Oliver

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