1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 301b9c6ece86..def1e009ad9d 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -1334,6 +1334,26 @@ bool bus_is_registered(const struct bus_type *bus)
 	return is_initialized;
 }
 
+/**
+ * bus_get_dev_root - return a pointer to the "device root" of a bus
+ * @bus: bus to return the device root of.
+ *
+ * If a bus has a "device root" structure, return it, WITH THE REFERENCE
+ * COUNT INCREMENTED.
+ *
+ * Note, when finished with the device, a call to put_device() is required.
+ *
+ * If the device root is not present (or bus is not a valid pointer), NULL
+ * will be returned.
+ */
+struct device *bus_get_dev_root(const struct bus_type *bus)
+{
+	if (bus)
+		return get_device(bus->dev_root);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(bus_get_dev_root);
+
 int __init buses_init(void)
 {
 	bus_kset = kset_create_and_add("bus", &bus_uevent_ops, NULL);