I've been going through the locking and its really hard to follow quite
what is being locked in places. The irq one is pretty nasty. We can't allow
an IRQ to come in - even momentarily during the lock and disable irq
sequence, yet we can't disable the irq with locks held as the IRQ might
already be running.
I have the request queue stuff partly fixed now, I need to sort out the error
propogation bit.
> Recall that it was around 2.1.122 that offered to pick up the pieces and
> go.......Thus I have been playing catchup from before day one.
Yes. And I dont envy any one trying to fix that IDE locking bug - its a nasty
one
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