Weird interrupt problem

[Anton Blanchard]

> It may be some kind of race within the openpic driver when we keep
> enabling/disabling the source in ack() and end(). I'm pretty sure
> we don't really need them, oh well...

Yeah I pulled that out of the ppc64 tree and I havent found a problem
yet. Maybe there was some buggy ppc32 hardware that required this?

Anton

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