powerpc/8xx: Fix build breakage with sparse irq changes

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/platforms/8xx/m8xx_setup.c b/arch/powerpc/platforms/8xx/m8xx_setup.c
index 385acfc..242954c 100644 (file)
--- a/arch/powerpc/platforms/8xx/m8xx_setup.c
+++ b/arch/powerpc/platforms/8xx/m8xx_setup.c
@@ -222,7 +222,7 @@ static void cpm_cascade(unsigned int irq, struct irq_desc *desc)
        int cascade_irq;
 
        if ((cascade_irq = cpm_get_irq()) >= 0) {
-               struct irq_desc *cdesc = irq_desc + cascade_irq;
+               struct irq_desc *cdesc = irq_to_desc(cascade_irq);
 
                generic_handle_irq(cascade_irq);
                cdesc->chip->eoi(cascade_irq);