net: handle errors from device_rename

device_rename can fail with -EEXIST or -ENOMEM, so handle any
problems.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/dev.c b/net/core/dev.c
index a1607bc..ce88c0d 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -903,7 +903,11 @@ int dev_change_name(struct net_device *dev, char *newname)
                strlcpy(dev->name, newname, IFNAMSIZ);
 
 rollback:
-       device_rename(&dev->dev, dev->name);
+       err = device_rename(&dev->dev, dev->name);
+       if (err) {
+               memcpy(dev->name, oldname, IFNAMSIZ);
+               return err;
+       }
 
        write_lock_bh(&dev_base_lock);
        hlist_del(&dev->name_hlist);