Quoting Eric W. Biederman (ebied...@xmission.com):
> I am not currently working on a patch for this, but I will be happy to
> review one. At a quick glance it looks like this could just be as
> simple as calling kobject_uevent at the proper time, but testing and
> reading through the relevant code paths is probably a good idea as there
> always seems to be gotchas in that code.
>
> Eric
This (the simple fix) works for me, actually.
I do notice the ifdef shouldn't be needed, all the better.
>From b436802aa8ae80f699b3d7bcf584d3e86af7355a Mon Sep 17 00:00:00 2001
From: Serge Hallyn <serge.hal...@canonical.com>
Date: Fri, 12 Oct 2012 21:42:05 +0100
Subject: [PATCH 1/1] dev_change_net_namespace: send a KOBJ_REMOVED to
original netns
Signed-off-by: Serge Hallyn <serge.hal...@canonical.com>
---
net/core/dev.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/net/core/dev.c b/net/core/dev.c
index e2215ee..8062a5a 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6172,6 +6172,10 @@ int dev_change_net_namespace(struct net_device *dev,
struct net *net, const char
dev_uc_flush(dev);
dev_mc_flush(dev);
+ /* Send a netdev-removed uevent to the old namespace */
+#ifdef CONFIG_HOTPLUG
+ kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE);
+#endif
/* Actually switch the network namespace */
dev_net_set(dev, net);
--
1.7.9.5
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