Linux 4.14.95

[thirdparty/kernel/stable-queue.git] / releases / 4.9.132 / net-hns-add-netif_carrier_off-before-change-speed-and-duplex.patch

From foo@baz Thu Oct  4 12:38:43 PDT 2018
From: Peng Li <lipeng321@huawei.com>
Date: Mon, 27 Aug 2018 09:59:30 +0800
Subject: net: hns: add netif_carrier_off before change speed and duplex

From: Peng Li <lipeng321@huawei.com>

[ Upstream commit 455c4401fe7a538facaffb35b906ce19f1ece474 ]

If there are packets in hardware when changing the speed
or duplex, it may cause hardware hang up.

This patch adds netif_carrier_off before change speed and
duplex in ethtool_ops.set_link_ksettings, and adds
netif_carrier_on after complete the change.

Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/hisilicon/hns/hns_ethtool.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
@@ -243,7 +243,9 @@ static int hns_nic_set_link_ksettings(st
 	}
 
 	if (h->dev->ops->adjust_link) {
+		netif_carrier_off(net_dev);
 		h->dev->ops->adjust_link(h, (int)speed, cmd->base.duplex);
+		netif_carrier_on(net_dev);
 		return 0;
 	}