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>

1 files changed, 15 insertions, 2 deletions

diff --git a/drivers/base/class.c b/drivers/base/class.c
index 4f1df2e8fd74..b80d91cc8c3a 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -47,6 +47,18 @@ static ssize_t class_attr_store(struct kobject *kobj, struct attribute *attr,
         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 kobj_ns_type_operations *class_child_ns_type(struct kobject
 }
 
 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 = {