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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 <[email protected]> Signed-off-by: Grant Likely <[email protected]> Acked-by: Benjamin Herrenschmidt <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>