[PATCH] powerpc/mpic: Fix MPIC_BROKEN_REGREAD on non broken MPICs

[Olof Johansson]

On Mon, Jul 06, 2009 at 12:08:52PM +1000, Michael Ellerman wrote:
> The workaround enabled by CONFIG_MPIC_BROKEN_REGREAD does not work
> on non-broken MPICs. The symptom is no interrupts being received.
> 
> The fix is twofold. Firstly the code was broken for multiple isus,
> we need to index into the shadow array with the src_no, not the idx.
> Secondly, we always do the read, but only use the VECPRI_MASK and
> VECPRI_ACTIVITY bits from the hardware, the rest of "val" comes
> from the shadow.

I'm travelling without remote access to a machine to test this on. Given
that it changes the errata workaround (subtly), I'd appreciate the chance
to give it a go before it gets merged.

Unfortunately I forgot to make sure that my remote console server was
up before I left. :-)

-Olof