diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 5277949e82e0..3b3ad6b08873 100755
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -191,6 +191,8 @@ int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask,
 	if (!chip || !chip->irq_set_affinity)
 		return -EINVAL;
 
+	/* IRQs only run on the first CPU in the affinity mask; reflect that */
+	mask = cpumask_of(cpumask_first(mask));
 	ret = chip->irq_set_affinity(data, mask, force);
 	switch (ret) {
 	case IRQ_SET_MASK_OK: