On Mon, 8 Sep 2008 17:32:50 -0700
Andrew Morton <akpm@linux-foundation.org> wrote:

quoted text
> On Mon, 08 Sep 2008 10:11:46 -0600
> Joe Peterson <joe@skyrush.com> wrote:
> 
> > +	spin_lock_irqsave(&tty->echo_lock, flags);
> >  	lock_kernel();
> 
> Taking a spinlock outside lock_kernel() isn't good, and is quite unusual.
> 
> - It might be ab/ba deadlockable (I didn't check) (I trust you always
>   test with lockdep enabled?)

lock_kernel can sleep. Its not allowed...

Alan
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