net: print a notification on device rename

Currently it's done silently (from the kernel part), and thus it might be
hard to track the renames from logs.

Add a simple netdev_info() to notify the rename, but only in case the
previous name was valid.

CC: "David S. Miller" <davem@davemloft.net>
CC: Eric Dumazet <edumazet@google.com>
CC: Vlad Yasevich <vyasevic@redhat.com>
CC: stephen hemminger <stephen@networkplumber.org>
CC: Jerry Chu <hkchu@google.com>
CC: Ben Hutchings <bhutchings@solarflare.com>
CC: David Laight <David.Laight@ACULAB.COM>
Signed-off-by: Veaceslav Falico <vfalico@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 81d61014fd9b..e52a3788d18d 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1113,6 +1113,9 @@ int dev_change_name(struct net_device *dev, const char *newname)
                 return err;
         }
 
+        if (oldname[0] && !strchr(oldname, '%'))
+                netdev_info(dev, "renamed from %s\n", oldname);
+
         old_assign_type = dev->name_assign_type;
         dev->name_assign_type = NET_NAME_RENAMED;