1 files changed, 16 insertions, 11 deletions

diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 221a64ab64f7..b21307b15b82 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -412,20 +412,25 @@ static int netdev_uevent(struct device *d, char **envp,
                          int num_envp, char *buf, int size)
 {
         struct net_device *dev = to_net_dev(d);
-        int i = 0;
-        int n;
+        int retval, len = 0, i = 0;
 
         /* pass interface to uevent. */
-        envp[i++] = buf;
-        n = snprintf(buf, size, "INTERFACE=%s", dev->name) + 1;
-        buf += n;
-        size -= n;
-
-        if ((size <= 0) || (i >= num_envp))
-                return -ENOMEM;
-
+        retval = add_uevent_var(envp, num_envp, &i,
+                                buf, size, &len,
+                                "INTERFACE=%s", dev->name);
+        if (retval)
+                goto exit;
+
+        /* pass ifindex to uevent.
+         * ifindex is useful as it won't change (interface name may change)
+         * and is what RtNetlink uses natively. */
+        retval = add_uevent_var(envp, num_envp, &i,
+                                buf, size, &len,
+                                "IFINDEX=%d", dev->ifindex);
+
+exit:
         envp[i] = NULL;
-        return 0;
+        return retval;
 }
 #endif