From 74a01180db4bbfd61304ae0ba1f60af55ffc803d Mon Sep 17 00:00:00 2001
From: Roderick Colenbrander <thunderbird2k@gmail.com>
Date: Thu, 3 Sep 2009 09:57:23 -0600
Subject: [PATCH] powerpc: Fix i8259 interrupt driver kernel crash on ML510

This patch fixes a null pointer exception caused by removal of
'ack()' for level interrupts in the Xilinx interrupt driver.  A recent
change to the xilinx interrupt controller removed the ack hook for
level irqs.

Signed-off-by: Roderick Colenbrander <thunderbird2k@gmail.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 arch/powerpc/sysdev/xilinx_intc.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/powerpc/sysdev/xilinx_intc.c b/arch/powerpc/sysdev/xilinx_intc.c
index 3ee1fd37bbfc..40edad520770 100644
--- a/arch/powerpc/sysdev/xilinx_intc.c
+++ b/arch/powerpc/sysdev/xilinx_intc.c
@@ -234,7 +234,6 @@ static void xilinx_i8259_cascade(unsigned int irq, struct irq_desc *desc)
 		generic_handle_irq(cascade_irq);
 
 	/* Let xilinx_intc end the interrupt */
-	desc->chip->ack(irq);
 	desc->chip->unmask(irq);
 }
 
-- 
2.20.1