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

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

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/powerpc/platforms/8xx/m8xx_setup.c b/arch/powerpc/platforms/8xx/m8xx_setup.c
index 385acfc48397..242954c4293f 100644
--- 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);