[PATCH] powerpc/cpm2 Fix set interrupt type

[paulfax]

This is a simple change to correct problems when using set_irq_type on platforms using CPM2.
This code correct the problem on most platform but still fails on 8272 derived platforms for some interrupts.
On 8272 PC2 & 3 are missing and PC 23 & 29 are added, which this patch does not address.

Signed-off-by: Paul Bilke <paul at conspiracy.net>
---




diff --git a/arch/powerpc/sysdev/cpm2_pic.c b/arch/powerpc/sysdev/cpm2_pic.c
index b16ca3e..78f1f7c 100644
--- a/arch/powerpc/sysdev/cpm2_pic.c
+++ b/arch/powerpc/sysdev/cpm2_pic.c
@@ -165,7 +165,7 @@ static int cpm2_set_irq_type(unsigned int virq, unsigned int flow_type)
                        edibit = (14 - (src - CPM2_IRQ_EXT1));
        else
                if (src >= CPM2_IRQ_PORTC15 && src <= CPM2_IRQ_PORTC0)
-                       edibit = (31 - (src - CPM2_IRQ_PORTC15));
+                       edibit = (31 - (CPM2_IRQ_PORTC0 - src));
                else
                        return (flow_type & IRQ_TYPE_LEVEL_LOW) ? 0 : -EINVAL;