Index: kernel/generic/src/ddi/irq.c
===================================================================
--- kernel/generic/src/ddi/irq.c	(revision 2057572a989f56acc5c906946caebf6b2e039bda)
+++ kernel/generic/src/ddi/irq.c	(revision de33dab3d6e266b32bfcf983b683fc6d18b2ac72)
@@ -139,4 +139,5 @@
 	link_initialize(&irq->link);
 	spinlock_initialize(&irq->lock, "irq.lock");
+	irq->preack = false;
 	irq->inr = -1;
 	irq->devno = -1;