Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Peng Li <lipeng321@huawei.com>
To:     <davem@davemloft.net>
CC:     <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linuxarm@huawei.com>, <yisen.zhuang@huawei.com>,
        <salil.mehta@huawei.com>, <lipeng321@huawei.com>
Subject: [PATCH V2 net 2/2] net: hns: add netif_carrier_off before change speed and duplex
Date:   Mon, 27 Aug 2018 09:59:30 +0800
Message-ID: <1535335170-111030-3-git-send-email-lipeng321@huawei.com>
In-Reply-To: <1535335170-111030-1-git-send-email-lipeng321@huawei.com>
References: <1535335170-111030-1-git-send-email-lipeng321@huawei.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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>
---
 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 08f3c47..774beda 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;
 	}
 
-- 
2.9.3