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-rw-r--r--include/linux/kobject.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index b49ff230beba..1ab0d624fb36 100644
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -119,6 +119,23 @@ extern void kobject_get_ownership(struct kobject *kobj,
kuid_t *uid, kgid_t *gid);
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(kref_read(&kobj->kref) == 0);
+
+ return kobj->sd && kobj->sd->dir.subdirs;
+}
+
struct kobj_type {
void (*release)(struct kobject *kobj);
const struct sysfs_ops *sysfs_ops;