Unloading USB driver while device is attached.

[M. Warner Losh]

In message: <200407191950.aa12733 at salmon.maths.tcd.ie>
            Ian Dowse <iedowse at maths.tcd.ie> writes:
: In message <20040719175241.GJ57678 at darkness.comp.waw.pl>, Pawel Jakub Dawidek w
: rites:
: >So, as I see it, device should be totally detached before unload and
: >I susspect that something is missing in USB layer, not in all drivers.
: >That's why when I load a driver again, USB thinks it is somehow connected
: >to existing device, but it isn't.
: 
: I'm not sure if it will help in this particular case, but I have a
: lot of local cleanups and improvements in the USB code. There's a
: large patch at
: 
: 	http://people.freebsd.org/~iedowse/usb.diff
: 
: but unfortunately I haven't had time to work on this lately (and
: there are all the problems of divergence from NetBSD etc. if bits
: of this get committed). The (small) uhub.c changes look like they
: might possibly help in your case. With the full patch I was able
: to `kldunload usb' without crashes a while ago, but there were still
: memory leaks.

I'm going to start merging in some of these changes, if you don't
mind.

Warner