batman-adv: warn if added interface is part of a bridge

Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>

1 files changed, 8 insertions, 0 deletions

diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index d3e0e32e51c6..68b667c1d85e 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -281,6 +281,14 @@ int hardif_enable_interface(struct hard_iface *hard_iface,
         if (!atomic_inc_not_zero(&hard_iface->refcount))
                 goto out;
 
+        /* hard-interface is part of a bridge */
+        if (hard_iface->net_dev->priv_flags & IFF_BRIDGE_PORT)
+                pr_err("You are about to enable batman-adv on '%s' which "
+                       "already is part of a bridge. Unless you know exactly "
+                       "what you are doing this is probably wrong and won't "
+                       "work the way you think it would.\n",
+                       hard_iface->net_dev->name);
+
         soft_iface = dev_get_by_name(&init_net, iface_name);
 
         if (!soft_iface) {