[PATCH] Skip down interfaces

[Dan Smith <danms-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>]

This makes the netns checkpoint code skip interfaces that are not up.
Later, we want to make it possible to checkpoint down interfaces with
a flag, but for now this helps prevent people from getting stuck on
stock kernels with various unsupported and persistent virtual interfaces,
such as tunnel devices.

Signed-off-by: Dan Smith <danms-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
Cc: serue-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org
---
 net/checkpoint_dev.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/net/checkpoint_dev.c b/net/checkpoint_dev.c
index bc0415d..1e053f9 100644
--- a/net/checkpoint_dev.c
+++ b/net/checkpoint_dev.c
@@ -268,7 +268,13 @@ int checkpoint_netns(struct ckpt_ctx *ctx, void *ptr)
 		goto out;
 
 	for_each_netdev(net, dev) {
-		ret = checkpoint_obj(ctx, dev, CKPT_OBJ_NETDEV);
+		if (dev->flags & IFF_UP)
+			ret = checkpoint_obj(ctx, dev, CKPT_OBJ_NETDEV);
+		else
+			/* TODO: There should be a flag to enable checkpoint
+			 * of downed interfaces
+			 */
+			ret = 0;
 		if (ret < 0)
 			break;
 	}
-- 
1.6.2.5