On Mon, Nov 19, 2007 at 05:54:56PM -0500, Michael Lorenz wrote:

> Not sure if that was the purpose but even with this I still get  
> deadlocks when opening a zs on SMP. Any idea what to look for? So far  
> I couldn't even figure out where exactly the deadlock occurs.

Is there a head on this machine? Have you tried with a LOCKDEBUG kernel? Not
much use if there is only a serial port as console, though. The only major
change is that the driver now uses a mutex where before it used simple_lock
+ splzs. Can you double check that IPL_TTY is actually enough to block the
serial interrupt? If it's not, it will deadlock pretty quickly.

Thanks,
Andrew