From owner-freebsd-usb@FreeBSD.ORG  Tue Jul 21 13:20:47 2009
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From: Hans Petter Selasky <hselasky@c2i.net>
To: Alfred Perlstein <alfred@freebsd.org>
Date: Tue, 21 Jul 2009 14:20:32 +0200
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Cc: usb@freebsd.org, freebsd-current@freebsd.org,
	Andrew Thompson <thompsa@freebsd.org>
Subject: Re: USB polling (75% done)
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On Monday 20 July 2009 23:51:41 Alfred Perlstein wrote:
> * Hans Petter Selasky <hselasky@c2i.net> [090715 13:37] wrote:
> > Hi,
> >
> > I've added minimal polling support to the USB P4 repository now. Patch
> > can be found here:
> >
> > http://perforce.freebsd.org/chv.cgi?CH=166148
> >
> > Dumping core to USB disk: Tested and works.
> >
> > Using USB keyboard in KDB: Does not work because Giant is not locked when
> > calling into the UKBD's get char routine. UKBD is Giant locked. Someone
> > familiar with the keyboard system on FreeBSD please step forward and fix
> > this so that UKBD gets independent of the Giant mutex.
>
> the ukbd driver needs giant?

I think the keyboard mux is under Giant, and does not have any concept about 
mutexes. Most simple solution would be that DDB locks Giant before entering 
into the keyboard code.

--HPS