[PATCH] kobject_add_dir

Adding kobject_add_dir() function which creates a subdirectory
for a given kobject.

Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index 7ece63f..4cb1214 100644 (file)
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -80,6 +80,8 @@ extern void kobject_unregister(struct kobject *);
 extern struct kobject * kobject_get(struct kobject *);
 extern void kobject_put(struct kobject *);
 
+extern struct kobject *kobject_add_dir(struct kobject *, const char *);
+
 extern char * kobject_get_path(struct kobject *, gfp_t);
 
 struct kobj_type {

diff --git a/lib/kobject.c b/lib/kobject.c
index 36668c8..25204a4 100644 (file)
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -385,6 +385,44 @@ void kobject_put(struct kobject * kobj)
 }
 
 
+static void dir_release(struct kobject *kobj)
+{
+       kfree(kobj);
+}
+
+static struct kobj_type dir_ktype = {
+       .release        = dir_release,
+       .sysfs_ops      = NULL,
+       .default_attrs  = NULL,
+};
+
+/**
+ *     kobject_add_dir - add sub directory of object.
+ *     @parent:        object in which a directory is created.
+ *     @name:  directory name.
+ *
+ *     Add a plain directory object as child of given object.
+ */
+struct kobject *kobject_add_dir(struct kobject *parent, const char *name)
+{
+       struct kobject *k;
+
+       if (!parent)
+               return NULL;
+
+       k = kzalloc(sizeof(*k), GFP_KERNEL);
+       if (!k)
+               return NULL;
+
+       k->parent = parent;
+       k->ktype = &dir_ktype;
+       kobject_set_name(k, name);
+       kobject_register(k);
+
+       return k;
+}
+EXPORT_SYMBOL_GPL(kobject_add_dir);
+
 /**
  *     kset_init - initialize a kset for use
  *     @k:     kset