The changes make the driver SMP-aware. That is, avoid using cli/sti but
using spin_lock_irq/spin_unlock_irq.
That's all for the change of plip.c itself, no protocol change, no
interface change.
It seems that the problem you mentioned is about routing table. You
need to add the route by yourself in recent kernel (if I remembered
correctly, it is automatically added in old kernel). I think that
this is because of change of routing table handling.
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