diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index 350f188c92d2..baf8edebe26f 100644
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c

@@ -140,7 +140,7 @@ int __init arch_probe_nr_irqs(void)
 static bool migrate_one_irq(struct irq_desc *desc)
 {
 	struct irq_data *d = irq_desc_get_irq_data(desc);
-	const struct cpumask *affinity = d->affinity;
+	const struct cpumask *affinity = irq_data_get_affinity_mask(d);
 	struct irq_chip *c;
 	bool ret = false;
 

@@ -160,7 +160,7 @@ static bool migrate_one_irq(struct irq_desc *desc)
 	if (!c->irq_set_affinity)
 		pr_debug("IRQ%u: unable to set affinity\n", d->irq);
 	else if (c->irq_set_affinity(d, affinity, false) == IRQ_SET_MASK_OK && ret)
-		cpumask_copy(d->affinity, affinity);
+		cpumask_copy(irq_data_get_affinity_mask(d), affinity);
 
 	return ret;
 }

diff --git a/include/linux/irq.h b/include/linux/irq.h
index 43581e166298..2eb82257aaee 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h

@@ -650,6 +650,18 @@ static inline int irq_data_get_node(struct irq_data *d)
 	return irq_common_data_get_node(d->common);
 }
 
+static inline struct cpumask *irq_get_affinity_mask(int irq)
+{
+	struct irq_data *d = irq_get_irq_data(irq);
+
+	return d ? d->affinity : NULL;
+}
+
+static inline struct cpumask *irq_data_get_affinity_mask(struct irq_data *d)
+{
+	return d->affinity;
+}
+
 unsigned int arch_dynirq_lower_bound(unsigned int from);
 
 int __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,