diff options
| author | Yasuaki Ishimatsu | 2012-12-11 16:00:57 -0800 |
|---|---|---|
| committer | Linus Torvalds | 2012-12-11 17:22:23 -0800 |
| commit | 8c7b5b4ed948d1ddf9672ee932a16750b280822a (patch) | |
| tree | 2a2a95bda012882549753e1ce1d0de845f5db314 /drivers | |
| parent | 8732794b166196cc501c2ddd9e7c97cf45ab64c5 (diff) | |
memory-hotplug: suppress "Device nodeX does not have a release() function" warning
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."
The reason is node's device struct does not have a release() function.
So the patch registers node_device_release() to the device's release()
function for suppressing the warning message. Additionally, the patch
adds memset() to initialize a node struct into register_node(). Because
the node struct is part of node_devices[] array and it cannot be freed by
node_device_release(). So if system reuses the node struct, it has a
garbage.
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Jiang Liu <liuj97@gmail.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/base/node.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/drivers/base/node.c b/drivers/base/node.c index 28216ce74b3d..4282e82d9f26 100644 --- a/drivers/base/node.c +++ b/drivers/base/node.c @@ -252,6 +252,24 @@ static inline void hugetlb_register_node(struct node *node) {} static inline void hugetlb_unregister_node(struct node *node) {} #endif +static void node_device_release(struct device *dev) +{ + struct node *node = to_node(dev); + +#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS) + /* + * We schedule the work only when a memory section is + * onlined/offlined on this node. When we come here, + * all the memory on this node has been offlined, + * so we won't enqueue new work to this work. + * + * The work is using node->node_work, so we should + * flush work before freeing the memory. + */ + flush_work(&node->node_work); +#endif + kfree(node); +} /* * register_node - Setup a sysfs device for a node. @@ -265,6 +283,7 @@ 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; error = device_register(&node->dev); if (!error){ @@ -586,7 +605,6 @@ int register_one_node(int nid) void unregister_one_node(int nid) { unregister_node(node_devices[nid]); - kfree(node_devices[nid]); node_devices[nid] = NULL; } |