kern/118093: firewire bus reset hogs CPU, causing data to be lost

[Dieter]

> > I'll rephrase my question.  In the old days, locking was done with spl.
> > The new way is with mutex.  But with the spl calls being replaced with
> > noops, and as far as I can tell the driver is not using mutex, there
> > doesn't appear to be any locking.  So the driver can step on itself.
> 
> 
> Well, there is locking around a couple of mutex's via FW_GLOCK().

Ah, I wasn't grepping for the right string.  So there *is* mutex
locking.  Although the lingering spl calls are still troubling.