On Thu, Oct 17, 2013 at 09:54:11AM +0900, Simon Horman wrote: > I did wonder if this solution is slightly sub-optimal as > now the mutex is taken both in netdev_dummy_rx_recv() > and netdev_dummy_rx_recv(). Then again, I'm not sure that > it is critical to optimise netdev-dummy. I agree, netdev-dummy isn't worth optimizing.