1 files changed, 11 insertions, 3 deletions

diff --git a/include/asm-powerpc/prom.h b/include/asm-powerpc/prom.h
index 39f04ef96f38..1fd7a2253e3a 100644
--- a/include/asm-powerpc/prom.h
+++ b/include/asm-powerpc/prom.h
@@ -332,10 +332,18 @@ extern int of_irq_map_one(struct device_node *device, int index,
 struct pci_dev;
 extern int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq);
 
-static inline void of_irq_to_resource(struct device_node *dev, int index, struct resource *r)
+static inline int of_irq_to_resource(struct device_node *dev, int index, struct resource *r)
 {
-        r->start = r->end = irq_of_parse_and_map(dev, index);
-        r->flags = IORESOURCE_IRQ;
+        int irq = irq_of_parse_and_map(dev, index);
+
+        /* Only dereference the resource if both the
+         * resource and the irq are valid. */
+        if (r && irq != NO_IRQ) {
+                r->start = r->end = irq;
+                r->flags = IORESOURCE_IRQ;
+        }
+
+        return irq;
 }