class: Implement support for class attrs in tagged sysfs directories.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/base/class.c b/drivers/base/class.c
index 4f1df2e..b80d91c 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -47,6 +47,18 @@
 	return ret;
 }
 
+static const void *class_attr_namespace(struct kobject *kobj,
+					const struct attribute *attr)
+{
+	struct class_attribute *class_attr = to_class_attr(attr);
+	struct subsys_private *cp = to_subsys_private(kobj);
+	const void *ns = NULL;
+
+	if (class_attr->namespace)
+		ns = class_attr->namespace(cp->class, class_attr);
+	return ns;
+}
+
 static void class_release(struct kobject *kobj)
 {
 	struct subsys_private *cp = to_subsys_private(kobj);
@@ -72,8 +84,9 @@
 }
 
 static const struct sysfs_ops class_sysfs_ops = {
-	.show	= class_attr_show,
-	.store	= class_attr_store,
+	.show	   = class_attr_show,
+	.store	   = class_attr_store,
+	.namespace = class_attr_namespace,
 };
 
 static struct kobj_type class_ktype = {