Ok
> I also acquire the same spin lock before modifying the list and release
> it when done. This is what causes the deadlock. I can possibly attempt
> to acquire the spin lock when it's already acquired inside the interrupt
> handler.
This occurs in a couple of sound drivers too. I ended up with
__dothing() which assumes you own the lock, and dothing() which is a wrapper
taking the lock and calling __dothing().
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