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Date:      Fri, 17 Jan 2003 10:20:24 -0800
From:      Darren Pilgrim <dmp@pantherdragon.org>
To:        Josef Karthauser <joe@FreeBSD.org>
Cc:        Anish Mistry <mistry.7@osu.edu>, freebsd-hackers@freebsd.org
Subject:   Re: USB hub detach causing panic in 4.7p3
Message-ID:  <3E284968.3080901@pantherdragon.org>
References:  <3E23F9A4.9030101@pantherdragon.org> <200301141003.16160.mistry.7@osu.edu> <3E246D91.50701@pantherdragon.org> <20030117133442.GH91944@genius.tao.org.uk>

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Josef Karthauser wrote:
> On Tue, Jan 14, 2003 at 12:05:37PM -0800, Darren Pilgrim wrote:
> 
>>>>I have a USB hub that's built into my Viewsonic PT775 monitor.  The hub 
>>>>probes during boot and post-boot attach as follows:
>>>>
>>>>When the hub is disconnected, whether by unplugging it or turning
>>>>off the monitor, I get a panic in 4.7p3 if there are no devices 
>>>>connected to the hub's downstream ports.
>>>
>><mass snip>
>>
>>>Would this PR be related? 
>>>http://www.freebsd.org/cgi/query-pr.cgi?pr=ports/45579
>>
>>I'm not sure?  I didn't have anything running, that I could tell, that 
>>would have had the uhub device open.  The machine was sitting idle at the 
>>login prompt.  If someone would like to point me at a list of what I need 
>>to do to produce useful debugging information, I'll gladly do so.
> 
> There are a number of brokenisms in the USB stack in -stable.  As to
> whether they will get fixed or not is a matter of whether anyone has the
> time to MFC the USB stack from -current or not.  It's much better over
> there, and I've already merged the framework to make it easier to MFC,
> but it is very unlikely that I will be attempting the work myself as I
> don't use USB on -stable myself.

So the problem I'm having is a known issue when detaching a uhub device, then?


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