net: set name assign type for renamed devices

Based on a patch from David Herrmann.

This is the only place devices can be renamed.

v9: restore revers-christmas-tree order of local variables

Signed-off-by: Tom Gundersen <teg@jklm.no>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 0 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 6e2a2cd82321..38793fb84a35 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1082,6 +1082,7 @@ static int dev_get_valid_name(struct net *net,
  */
 int dev_change_name(struct net_device *dev, const char *newname)
 {
+        unsigned char old_assign_type;
         char oldname[IFNAMSIZ];
         int err = 0;
         int ret;
@@ -1109,10 +1110,14 @@ int dev_change_name(struct net_device *dev, const char *newname)
                 return err;
         }
 
+        old_assign_type = dev->name_assign_type;
+        dev->name_assign_type = NET_NAME_RENAMED;
+
 rollback:
         ret = device_rename(&dev->dev, dev->name);
         if (ret) {
                 memcpy(dev->name, oldname, IFNAMSIZ);
+                dev->name_assign_type = old_assign_type;
                 write_seqcount_end(&devnet_rename_seq);
                 return ret;
         }
@@ -1141,6 +1146,8 @@ rollback:
                         write_seqcount_begin(&devnet_rename_seq);
                         memcpy(dev->name, oldname, IFNAMSIZ);
                         memcpy(oldname, newname, IFNAMSIZ);
+                        dev->name_assign_type = old_assign_type;
+                        old_assign_type = NET_NAME_RENAMED;
                         goto rollback;
                 } else {
                         pr_err("%s: name change rollback failed: %d\n",