[PATCH 1/2] sit: Unregister sit devices with rtnl_link_ops

[Steven Rostedt <rostedt@goodmis.org>]

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From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>

The backport of upstream commit 205983c43700ac3 ("sit: allow to use rtnl
ops on fb tunnel") had a dependency on commit 5e6700b3bf98 ("sit: add
support of x-netns"). The dependency was on the way that commit
unregistered the sit devices.

Since the entire commit 5e6700b3bf98 is not necessary for a backport
we only need to backport the part required for the backport of
205983c43700ac3. This is the loop to unregister the sit devices where
dev->rtnl_link_ops == &sit_link_ops.

Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 net/ipv6/sit.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 0491264..3652033 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -1529,6 +1529,10 @@ static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_hea
 {
 	int prio;
 
+	for_each_netdev_safe(net, dev, aux)
+		if (dev->rtnl_link_ops == &sit_link_ops)
+			unregister_netdevice_queue(dev, head);
+
 	for (prio = 1; prio < 4; prio++) {
 		int h;
 		for (h = 0; h < HASH_SIZE; h++) {
@@ -1536,7 +1540,12 @@ static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_hea
 
 			t = rtnl_dereference(sitn->tunnels[prio][h]);
 			while (t != NULL) {
-				unregister_netdevice_queue(t->dev, head);
+				/* If dev is in the same netns, it has already
+				 * been added to the list by the previous loop.
+				 */
+				if (dev_net(t->dev) != net)
+					unregister_netdevice_queue(t->dev,
+								   head);
 				t = rtnl_dereference(t->next);
 			}
 		}
-- 
1.8.4.3