[PATCH 2/2][Cosmic][SRU Bionic] net: hns: add netif_carrier_off before change speed and duplex

[dann frazier]

From: Peng Li <lipeng321 at huawei.com>

BugLink: https://bugs.launchpad.net/bugs/1792209

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 at huawei.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
(cherry picked from commit 455c4401fe7a538facaffb35b906ce19f1ece474)
Signed-off-by: dann frazier <dann.frazier at canonical.com>
---
 drivers/net/ethernet/hisilicon/hns/hns_ethtool.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
index 2e14a3ae1d8be..c1e947bb852ff 100644
--- 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(struct net_device *net_dev,
 	}
 
 	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;
 	}
 
-- 
2.19.0