linux-kernel - [PATCH AUTOSEL 4.18 080/131] net: mvneta: fix mtu change on port without link

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Message-ID: <20180902064601.183036-80-alexander.levin@microsoft.com>
Date:   Sun, 2 Sep 2018 13:04:45 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Yelena Krivosheev <yelena@...vell.com>,
        Gregory CLEMENT <gregory.clement@...tlin.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.18 080/131] net: mvneta: fix mtu change on port
 without link

From: Yelena Krivosheev <yelena@...vell.com>

[ Upstream commit 8466baf788ec3e18836bd9c91ba0b1a07af25878 ]

It is incorrect to enable TX/RX queues (call by mvneta_port_up()) for
port without link. Indeed MTU change for interface without link causes TX
queues to stuck.

Fixes: c5aff18204da ("net: mvneta: driver for Marvell Armada 370/XP
network unit")
Signed-off-by: Yelena Krivosheev <yelena@...vell.com>
[gregory.clement: adding Fixes tags and rewording commit log]
Signed-off-by: Gregory CLEMENT <gregory.clement@...tlin.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/net/ethernet/marvell/mvneta.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 82ac1d10f239..b4253d0e056b 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -3196,7 +3196,6 @@ static int mvneta_change_mtu(struct net_device *dev, int mtu)
 
 	on_each_cpu(mvneta_percpu_enable, pp, true);
 	mvneta_start_dev(pp);
-	mvneta_port_up(pp);
 
 	netdev_update_features(dev);
 
-- 
2.17.1