1 files changed, 15 insertions, 3 deletions

diff --git a/drivers/base/class.c b/drivers/base/class.c
index 6e2c3b064f53..9c6a0d6408e7 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -31,7 +31,7 @@ static ssize_t class_attr_show(struct kobject *kobj, struct attribute *attr,
         ssize_t ret = -EIO;
 
         if (class_attr->show)
-                ret = class_attr->show(cp->class, buf);
+                ret = class_attr->show(cp->class, class_attr, buf);
         return ret;
 }
 
@@ -43,7 +43,7 @@ static ssize_t class_attr_store(struct kobject *kobj, struct attribute *attr,
         ssize_t ret = -EIO;
 
         if (class_attr->store)
-                ret = class_attr->store(cp->class, buf, count);
+                ret = class_attr->store(cp->class, class_attr, buf, count);
         return ret;
 }
 
@@ -63,7 +63,7 @@ static void class_release(struct kobject *kobj)
         kfree(cp);
 }
 
-static struct sysfs_ops class_sysfs_ops = {
+static const struct sysfs_ops class_sysfs_ops = {
         .show   = class_attr_show,
         .store  = class_attr_store,
 };
@@ -219,6 +219,8 @@ static void class_create_release(struct class *cls)
  * This is used to create a struct class pointer that can then be used
  * in calls to device_create().
  *
+ * Returns &struct class pointer on success, or ERR_PTR() on error.
+ *
  * Note, the pointer created here is to be destroyed when finished by
  * making a call to class_destroy().
  */
@@ -490,6 +492,16 @@ void class_interface_unregister(struct class_interface *class_intf)
         class_put(parent);
 }
 
+ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
+                                char *buf)
+{
+        struct class_attribute_string *cs;
+        cs = container_of(attr, struct class_attribute_string, attr);
+        return snprintf(buf, PAGE_SIZE, "%s\n", cs->str);
+}
+
+EXPORT_SYMBOL_GPL(show_class_attr_string);
+
 struct class_compat {
         struct kobject *kobj;
 };