geneve: check MTU for a minimum in geneve_change_mtu()

geneve_change_mtu() will be used not only as ndo_change_mtu() callback,
but also to verify a user specified MTU on a new link creation in the
next patch.

Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index b650f845af252bae8ed21051e818dde36d8152c1..ae649f699a92c702728e09e924e20b87a4e74a90 100644 (file)
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -942,11 +942,10 @@ tx_error:
 
 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
 {
-       /* Only possible if called internally, ndo_change_mtu path's new_mtu
-        * is guaranteed to be between dev->min_mtu and dev->max_mtu.
-        */
        if (new_mtu > dev->max_mtu)
                new_mtu = dev->max_mtu;
+       else if (new_mtu < dev->min_mtu)
+               new_mtu = dev->min_mtu;
 
        dev->mtu = new_mtu;
        return 0;