linux-kernel - [PATCH 7/6] driver core: add default groups to struct class

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Message-ID: <20130710220531.GA4210@kroah.com>
Date:	Wed, 10 Jul 2013 15:05:31 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	oliver+list@...inagl.nl, linux@...ck-us.net, khali@...ux-fr.org,
	gregkh@...uxfoundation.org
Subject: [PATCH 7/6] driver core: add default groups to struct class


We should be using groups, not attribute lists, for classes to allow
subdirectories, and soon, binary files.  Groups are just more flexible
overall, so add them.

The dev_attrs list will go away after all in-kernel users are converted
to use dev_groups.

Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
Forgot this one in the series, it adds support to classes for groups, so
that we can handle binary attributes properly for them as well.

 drivers/base/core.c    |    8 +++++++-
 include/linux/device.h |    4 +++-
 2 files changed, 10 insertions(+), 2 deletions(-)

--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -528,9 +528,12 @@ static int device_add_attrs(struct devic
 	int error;
 
 	if (class) {
-		error = device_add_attributes(dev, class->dev_attrs);
+		error = device_add_groups(dev, class->dev_groups);
 		if (error)
 			return error;
+		error = device_add_attributes(dev, class->dev_attrs);
+		if (error)
+			goto err_remove_class_groups;
 		error = device_add_bin_attributes(dev, class->dev_bin_attrs);
 		if (error)
 			goto err_remove_class_attrs;
@@ -563,6 +566,9 @@ static int device_add_attrs(struct devic
  err_remove_class_attrs:
 	if (class)
 		device_remove_attributes(dev, class->dev_attrs);
+ err_remove_class_groups:
+	if (class)
+		device_remove_groups(dev, class->dev_groups);
 
 	return error;
 }
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -313,6 +313,7 @@ int subsys_virtual_register(struct bus_t
  * @name:	Name of the class.
  * @owner:	The module owner.
  * @class_attrs: Default attributes of this class.
+ * @dev_groups:	Default attributes of the devices that belong to the class.
  * @dev_attrs:	Default attributes of the devices belong to the class.
  * @dev_bin_attrs: Default binary attributes of the devices belong to the class.
  * @dev_kobj:	The kobject that represents this class and links it into the hierarchy.
@@ -342,7 +343,8 @@ struct class {
 	struct module		*owner;
 
 	struct class_attribute		*class_attrs;
-	struct device_attribute		*dev_attrs;
+	struct device_attribute		*dev_attrs;	/* use dev_groups instead */
+	const struct attribute_group	**dev_groups;
 	struct bin_attribute		*dev_bin_attrs;
 	struct kobject			*dev_kobj;
 
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