Re: uaudio attach panic: Giant not locked

2009/8/5 Hans Petter Selasky <hselasky_at_c2i.net>:
> On Wednesday 05 August 2009 13:43:11 Robert Watson wrote:
>> On Wed, 5 Aug 2009, Ed Schouten wrote:
>> > * Lucius Windschuh <lwindschuh_at_googlemail.com> wrote:
>> >> So I updated my machine to CURRENT r196062 and use a USB audio
>> >> converter. Attaching it to the machine leads to a kernel panic:
>> >>
>> >> <snip>
>> >
>> > I suspect this has something to do with the Newbus locking, which causes
>> > some pieces of code to run without Giant held, while they previously did.
>>
>> There's a patch in the re_at_ queue to re-add Giant around newbus attachment,
>> per John Baldwin's request.  However, committing that patch is stalled
>> while issues with the svn->cvs export of the new RELENG_8 branch are
>> resolved.  I expect to see the patch go into the tree RSN.
>>
>
> Try this patch:
>
> http://perforce.freebsd.org/chv.cgi?CH=167030

Hans,
I recall of a similar problem in ukbd. I resolved it by acquiring
Giant earlier in  ukbd_attach(), but probabilly I could just bring it
down and pass a NULL pointer to usbd_do_transfer(), right?

Thanks,
Attilio


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