Date: Tue, 21 Jul 2009 08:47:52 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-current@freebsd.org Cc: usb@freebsd.org, Alfred Perlstein <alfred@freebsd.org>, Andrew Thompson <thompsa@freebsd.org>, Hans Petter Selasky <hselasky@c2i.net> Subject: Re: USB polling (75% done) Message-ID: <200907210847.52802.jhb@freebsd.org> In-Reply-To: <200907211420.33571.hselasky@c2i.net> References: <1280352d0907101020q69f494cdndb01ff14ecf7ea8c@mail.gmail.com> <20090720215141.GL49724@elvis.mu.org> <200907211420.33571.hselasky@c2i.net>
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On Tuesday 21 July 2009 8:20:32 am Hans Petter Selasky wrote: > 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. In general if you are in DDB you should not be using any locks at all. -- John Baldwin
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