linux-kernel - [PATCH net-next 05/17] net: hns: bug fix about restart auto-negotiation

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Date:   Wed, 9 Nov 2016 18:13:49 +0000
From:   Salil Mehta <salil.mehta@...wei.com>
To:     <davem@...emloft.net>
CC:     <salil.mehta@...wei.com>, <yisen.zhuang@...wei.com>,
        <mehta.salil.lnk@...il.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>,
        Daode Huang <huangdaode@...ilicon.com>
Subject: [PATCH net-next 05/17] net: hns: bug fix about restart auto-negotiation

From: Daode Huang <huangdaode@...ilicon.com>

When set auto-negotiation off and duplex half, if run "ethtool -r ethX"
on port with phy, then the port will be failed to work. It should
forbid to start auto-negotiation when auto-negotiate is off. This
patch add the limited condition.

Reported-by: Jinchuang Tian <tianjinchuang1@...wei.com>
Signed-off-by: Daode Huang <huangdaode@...ilicon.com>
Reviewed-by: Yisen Zhuang <yisen.zhuang@...wei.com>
Reviewed-by: lipeng <lipeng321@...wei.com>
Signed-off-by: Salil Mehta <salil.mehta@...wei.com>
---
 drivers/net/ethernet/hisilicon/hns/hns_ethtool.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
index 87d5c94..3ac2183 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
@@ -1178,7 +1178,8 @@ static int hns_nic_nway_reset(struct net_device *netdev)
 	struct phy_device *phy = netdev->phydev;
 
 	if (netif_running(netdev)) {
-		if (phy)
+		/* if autoneg is disabled, don't restart auto-negotiation */
+		if (phy && phy->autoneg == AUTONEG_ENABLE)
 			ret = genphy_restart_aneg(phy);
 	}
 
-- 
1.7.9.5