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Date:      Mon, 19 Jul 2004 17:01:32 -0600 (MDT)
From:      "M. Warner Losh" <imp@bsdimp.com>
To:        iedowse@maths.tcd.ie
Cc:        pjd@freebsd.org
Subject:   Re: Unloading USB driver while device is attached. 
Message-ID:  <20040719.170132.52458790.imp@bsdimp.com>
In-Reply-To: <200407191950.aa12733@salmon.maths.tcd.ie>
References:  <20040719175241.GJ57678@darkness.comp.waw.pl> <200407191950.aa12733@salmon.maths.tcd.ie>

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In message: <200407191950.aa12733@salmon.maths.tcd.ie>
            Ian Dowse <iedowse@maths.tcd.ie> writes:
: In message <20040719175241.GJ57678@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



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