drivers/base/node: Avoid manual device_create_file() calls

Instead of manual calls of multiple device_create_file() and
device_remove_file(), use the static attribute groups assigned to the
new device.  This also fixes the possible races, too.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/base/node.c b/drivers/base/node.c
index 36fabe4..06dce51 100644 (file)
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -200,6 +200,25 @@ static ssize_t node_read_distance(struct device *dev,
 }
 static DEVICE_ATTR(distance, S_IRUGO, node_read_distance, NULL);
 
+static struct attribute *node_dev_attrs[] = {
+       &dev_attr_cpumap.attr,
+       &dev_attr_cpulist.attr,
+       &dev_attr_meminfo.attr,
+       &dev_attr_numastat.attr,
+       &dev_attr_distance.attr,
+       &dev_attr_vmstat.attr,
+       NULL
+};
+
+static struct attribute_group node_dev_attr_group = {
+       .attrs  = node_dev_attrs,
+};
+
+static const struct attribute_group *node_dev_attr_groups[] = {
+       &node_dev_attr_group,
+       NULL
+};
+
 #ifdef CONFIG_HUGETLBFS
 /*
  * hugetlbfs per node attributes registration interface:
@@ -273,16 +292,10 @@ static int register_node(struct node *node, int num, struct node *parent)
        node->dev.id = num;
        node->dev.bus = &node_subsys;
        node->dev.release = node_device_release;
+       node->dev.groups = node_dev_attr_groups;
        error = device_register(&node->dev);
 
        if (!error){
-               device_create_file(&node->dev, &dev_attr_cpumap);
-               device_create_file(&node->dev, &dev_attr_cpulist);
-               device_create_file(&node->dev, &dev_attr_meminfo);
-               device_create_file(&node->dev, &dev_attr_numastat);
-               device_create_file(&node->dev, &dev_attr_distance);
-               device_create_file(&node->dev, &dev_attr_vmstat);
-
                hugetlb_register_node(node);
 
                compaction_register_node(node);
@@ -299,13 +312,6 @@ static int register_node(struct node *node, int num, struct node *parent)
  */
 void unregister_node(struct node *node)
 {
-       device_remove_file(&node->dev, &dev_attr_cpumap);
-       device_remove_file(&node->dev, &dev_attr_cpulist);
-       device_remove_file(&node->dev, &dev_attr_meminfo);
-       device_remove_file(&node->dev, &dev_attr_numastat);
-       device_remove_file(&node->dev, &dev_attr_distance);
-       device_remove_file(&node->dev, &dev_attr_vmstat);
-
        hugetlb_unregister_node(node);          /* no-op, if memoryless node */
 
        device_unregister(&node->dev);