[PATCH] hrtimer: round up relative start time on low-res arches

[powerpc.git] / kernel / irq / handle.c

diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 3ff7b92..51df337 100644 (file)
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -117,14 +117,16 @@ fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs)
                /*
                 * No locking required for CPU-local interrupts:
                 */
-               desc->handler->ack(irq);
+               if (desc->handler->ack)
+                       desc->handler->ack(irq);
                action_ret = handle_IRQ_event(irq, regs, desc->action);
                desc->handler->end(irq);
                return 1;
        }
 
        spin_lock(&desc->lock);
-       desc->handler->ack(irq);
+       if (desc->handler->ack)
+               desc->handler->ack(irq);
        /*
         * REPLAY is when Linux resends an IRQ that was dropped earlier
         * WAITING is used by probe to mark irqs that are being tested