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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Stefano Brivio <sbrivio@redhat.com>,
        Sabrina Dubroca <sd@queasysnail.net>,
        Steffen Klassert <steffen.klassert@secunet.com>,
        Sasha Levin <alexander.levin@microsoft.com>
Subject: [PATCH 4.4 141/268] vti4: Dont override MTU passed on link creation via IFLA_MTU
Date:   Mon, 28 May 2018 12:01:55 +0200
Message-Id: <20180528100218.291151489@linuxfoundation.org>
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4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stefano Brivio <sbrivio@redhat.com>

[ Upstream commit 03080e5ec72740c1a62e6730f2a5f3f114f11b19 ]

Don't hardcode a MTU value on vti tunnel initialization,
ip_tunnel_newlink() is able to deal with this already. See also
commit ffc2b6ee4174 ("ip_gre: fix IFLA_MTU ignored on NEWLINK").

Fixes: 1181412c1a67 ("net/ipv4: VTI support new module for ip_vti.")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Acked-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/ipv4/ip_vti.c |    1 -
 1 file changed, 1 deletion(-)

--- a/net/ipv4/ip_vti.c
+++ b/net/ipv4/ip_vti.c
@@ -366,7 +366,6 @@ static int vti_tunnel_init(struct net_de
 	memcpy(dev->dev_addr, &iph->saddr, 4);
 	memcpy(dev->broadcast, &iph->daddr, 4);
 
-	dev->mtu		= ETH_DATA_LEN;
 	dev->flags		= IFF_NOARP;
 	dev->addr_len		= 4;
 	dev->features		|= NETIF_F_LLTX;