[PATCH] powerpc/mpic: Fix mapping of "DCR" based MPIC variants

[Akira Tsukamoto]

Hi Benjamin,

On Tue, 23 Jun 2009 12:47:59 +1000, 
Benjamin Herrenschmidt <benh at kernel.crashing.org> mentioned: 
> Commit 31207dab7d2e63795eb15823947bd2f7025b08e2
> "Fix incorrect allocation of interrupt rev-map"
> introduced a regression crashing on boot on machines using
> a "DCR" based MPIC, such as the Cell blades.
> 
> The reason is that the irq host data structure is initialized
> much later as a result of that patch, causing our calls to
> mpic_map() do be done before we have a host setup.
> 
> Unfortunately, this breaks _mpic_map_dcr() which uses the
> mpic->irqhost to get to the device node.
> 
> This fixes it by, instead, passing the device node explicitely
> to mpic_map().
> 
> Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
> ---
> 
>  arch/powerpc/sysdev/mpic.c |   29 ++++++++++++++++-------------
>  1 file changed, 16 insertions(+), 13 deletions(-)

I confirmed that the boot failure on IBM Cell Blades QS21/22 are fixed 
with this patch.

Acked-by: Akira Tsukamoto <akirat at rd.scei.sony.co.jp>

-- 
Akira Tsukamoto
Sony Computer Entertainment Inc. 
Architecture Lab.
Japan