Re: [PATCH] usb: storage: fix lockdep warning inside usb_stor_pre_reset

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On Thu, 2012-03-15 at 19:27 +0800, Ming Lei wrote:
> Hi,
> 
> On Thu, Mar 15, 2012 at 7:14 PM, Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> wrote:
> 
> >> > Also, is there a guarantee your: iface - interface[0] thing is <8 ? If
> >> > not, its broken.
> >>
> >> One configuration may support at most 32 interfaces in current usb stack,
> >> but looks there aren't such devices with more than 8 mass storage
> >> interfaces in reality.  Alan, did you hear such devices?
> >
> > So you're putting yourself in the hands of device manufacturers? Doesn't
> > seem like a good place to be if you ask me.
> 
> So how about using lockdep_set_class to address the problem?

Can do, you say the USB spec allows for 32 interfaces, what happens if a
device manufacturer 'mis-reads' the spec and puts 64 on? Will that
simply not work or will we get 'fun' results?
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