From b6151ce997af650c58c1d00ecc95c903e9e00c63 Mon Sep 17 00:00:00 2001
From: Dmitriy Linikov <dmitriy.linikov@gmail.com>
Date: Tue, 14 Aug 2018 07:13:41 -0600
Subject: [PATCH] drivers/net/tun.c: Fixed custom tun devname formatting.

---
 drivers/net/tun.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index d7b0cec6007..0a678f53464 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1231,6 +1231,13 @@ static int tun_dev_init(FAR struct tun_device_s *priv, FAR struct file *filep,
 
   tun_ifdown(&priv->dev);
 
+  /* Assign d_ifname if specified. */
+
+  if (devfmt)
+    {
+      strncpy(priv->dev.d_ifname, devfmt, IFNAMSIZ);
+    }
+
   /* Register the device with the OS so that socket IOCTLs can be performed */
 
   ret = netdev_register(&priv->dev, NET_LL_TUN);
@@ -1242,13 +1249,6 @@ static int tun_dev_init(FAR struct tun_device_s *priv, FAR struct file *filep,
       return ret;
     }
 
-  /* Assign d_ifname if specified. This must be done after registration */
-
-  if (devfmt)
-    {
-      strncpy(priv->dev.d_ifname, devfmt, IFNAMSIZ);
-    }
-
   priv->filep         = filep;        /* Set link to file */
   filep->f_priv       = priv;         /* Set link to TUN device */