Panics and potential memory corruption when pulling out a uath device

[Weongyo Jeong]

On Tue, May 19, 2009 at 12:08:45AM +0200, Lucius Windschuh wrote:
> 2009/5/18 Hans Petter Selasky <hselasky at c2i.net>:
> > Regarding the first panic, there seems to be a detach race in both upgt and
> > uath, which is not USB related. Try this patch:
> >
> > http://perforce.freebsd.org/chv.cgi?CH=162250
> 
> This fixes not only the first panic.
> I can't provoke any panic by pulling out the active device. Thanks.

Could you please test with this patch that is slightly different with
Hans's patch?  It try to unsetup after stopping the device.

If no problems I'd commit it.

regards,
Weongyo Jeong

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