When calling unregister_node(), the function shows following message at
device_release().

Device 'node2' does not have a release() function, it is broken and must be fixed.

So the patch implements node_device_release()

CC: Len Brown <redacted>
CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Paul Mackerras <redacted>
CC: Christoph Lameter <redacted>
Cc: Minchan Kim <redacted>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: KOSAKI Motohiro <redacted>
CC: Wen Congyang <redacted>
Signed-off-by: Yasuaki Ishimatsu <redacted>

Index: linux-3.5-rc1/drivers/base/node.c
===================================================================

--- linux-3.5-rc1.orig/drivers/base/node.c	2012-06-14 09:09:53.000000000 +0900
+++ linux-3.5-rc1/drivers/base/node.c	2012-06-25 18:40:45.810261969 +0900

@@ -252,6 +252,12 @@ static inline void hugetlb_register_node
 static inline void hugetlb_unregister_node(struct node *node) {}
 #endif

+static void node_device_release(struct device *dev)
+{
+	struct node *node_dev = to_node(dev);
+
+	memset(node_dev, 0, sizeof(struct node));
+}

 /*
  * register_node - Setup a sysfs device for a node.

@@ -265,6 +271,7 @@ int register_node(struct node *node, int

 	node->dev.id = num;
 	node->dev.bus = &node_subsys;
+	node->dev.release = node_device_release;
 	error = device_register(&node->dev);

 	if (!error){