netdev - [PATCH net-next 3/4] geneve: check MTU for a minimum in geneve_change

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Message-Id: <1524141752-25789-4-git-send-email-alexey.kodanev@oracle.com>
Date:   Thu, 19 Apr 2018 15:42:31 +0300
From:   Alexey Kodanev <alexey.kodanev@...cle.com>
To:     netdev@...r.kernel.org
Cc:     David Miller <davem@...emloft.net>,
        Alexey Kodanev <alexey.kodanev@...cle.com>
Subject: [PATCH net-next 3/4] 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@...cle.com>
---
 drivers/net/geneve.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index b650f84..ae649f6 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -942,11 +942,10 @@ static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
 
 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;
-- 
1.8.3.1