1 files changed, 4 insertions, 2 deletions

diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 3ff7b925c387..51df337b37db 100644
--- 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