efivars: make new_var and del_var binary sysfs files

These files should not be "normal" sysfs files as they really are binary
ones.  This patch makes them binary files and saves code in doing so.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Tested-by: Matt Domsch <Matt_Domsch@dell.com>
Cc: Matt Tolentino <matthew.e.tolentino@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/firmware/efivars.c

@@ -143,13 +143,6 @@ struct efivar_attribute efivar_attr_##_name = { \
 	.store = _store, \
 };
 
-#define VAR_SUBSYS_ATTR(_name, _mode, _show, _store) \
-struct subsys_attribute var_subsys_attr_##_name = { \
-	.attr = {.name = __stringify(_name), .mode = _mode}, \
-	.show = _show, \
-	.store = _store, \
-};
-
 #define to_efivar_attr(_attr) container_of(_attr, struct efivar_attribute, attr)
 #define to_efivar_entry(obj)  container_of(obj, struct efivar_entry, kobj)
 
@@ -408,21 +401,16 @@ static struct kobj_type efivar_ktype = {
 	.default_attrs = def_attrs,
 };
 
-static ssize_t
-dummy(struct kset *kset, char *buf)
-{
-	return -ENODEV;
-}
-
 static inline void
 efivar_unregister(struct efivar_entry *var)
 {
 	kobject_unregister(&var->kobj);
 }
 
 
-static ssize_t
-efivar_create(struct kset *kset, const char *buf, size_t count)
+static ssize_t efivar_create(struct kobject *kobj,
+			     struct bin_attribute *bin_attr,
+			     char *buf, loff_t pos, size_t count)
 {
 	struct efi_variable *new_var = (struct efi_variable *)buf;
 	struct efivar_entry *search_efivar, *n;
@@ -479,8 +467,9 @@ efivar_create(struct kset *kset, const char *buf, size_t count)
 	return count;
 }
 
-static ssize_t
-efivar_delete(struct kset *kset, const char *buf, size_t count)
+static ssize_t efivar_delete(struct kobject *kobj,
+			     struct bin_attribute *bin_attr,
+			     char *buf, loff_t pos, size_t count)
 {
 	struct efi_variable *del_var = (struct efi_variable *)buf;
 	struct efivar_entry *search_efivar, *n;
@@ -537,13 +526,14 @@ efivar_delete(struct kset *kset, const char *buf, size_t count)
 	return count;
 }
 
-static VAR_SUBSYS_ATTR(new_var, 0200, dummy, efivar_create);
-static VAR_SUBSYS_ATTR(del_var, 0200, dummy, efivar_delete);
+static struct bin_attribute var_subsys_attr_new_var = {
+	.attr = {.name = "new_var", .mode = 0200},
+	.write = efivar_create,
+};
 
-static struct subsys_attribute *var_subsys_attrs[] = {
-	&var_subsys_attr_new_var,
-	&var_subsys_attr_del_var,
-	NULL,
+static struct bin_attribute var_subsys_attr_del_var = {
+	.attr = {.name = "del_var", .mode = 0200},
+	.write = efivar_delete,
 };
 
 /*
@@ -728,11 +718,16 @@ efivars_init(void)
 	 * Now add attributes to allow creation of new vars
 	 * and deletion of existing ones...
 	 */
-
-	for (i = 0; (attr = var_subsys_attrs[i]) && !error; i++) {
-		if (attr->show && attr->store)
-			error = subsys_create_file(&vars_subsys, attr);
-	}
+	error = sysfs_create_bin_file(&vars_subsys.kobj,
+				      &var_subsys_attr_new_var);
+	if (error)
+		printk(KERN_ERR "efivars: unable to create new_var sysfs file"
+			" due to error %d\n", error);
+	error = sysfs_create_bin_file(&vars_subsys.kobj,
+				      &var_subsys_attr_del_var);
+	if (error)
+		printk(KERN_ERR "efivars: unable to create del_var sysfs file"
+			" due to error %d\n", error);
 
 	/* Don't forget the systab entry */