Merge pull request #46 from toradex/4.9-2.3.x-imx

4.9 2.3.x imx

1 files changed, 17 insertions, 0 deletions

diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index e6284591599e..5957c6a3fd7f 100644
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -113,6 +113,23 @@ extern void kobject_put(struct kobject *kobj);
 extern const void *kobject_namespace(struct kobject *kobj);
 extern char *kobject_get_path(struct kobject *kobj, gfp_t flag);
 
+/**
+ * kobject_has_children - Returns whether a kobject has children.
+ * @kobj: the object to test
+ *
+ * This will return whether a kobject has other kobjects as children.
+ *
+ * It does NOT account for the presence of attribute files, only sub
+ * directories. It also assumes there is no concurrent addition or
+ * removal of such children, and thus relies on external locking.
+ */
+static inline bool kobject_has_children(struct kobject *kobj)
+{
+	WARN_ON_ONCE(atomic_read(&kobj->kref.refcount) == 0);
+
+	return kobj->sd && kobj->sd->dir.subdirs;
+}
+
 struct kobj_type {
 	void (*release)(struct kobject *kobj);
 	const struct sysfs_ops *sysfs_ops;