linux-kernel - [PATCH 4.14 153/239] net: hns3: Fix for setting speed for phy failed problem

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Message-Id: <20191119051332.842670211@linuxfoundation.org>
Date:   Tue, 19 Nov 2019 06:19:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Fuyun Liang <liangfuyun1@...wei.com>,
        Peng Li <lipeng321@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 153/239] net: hns3: Fix for setting speed for phy failed problem

From: Fuyun Liang <liangfuyun1@...wei.com>

[ Upstream commit fd8133148eb6a733f9cfdaecd4d99f378e21d582 ]

The function of genphy_read_status is that reading phy information
from HW and using these information to update SW variable. If user
is using ethtool to setting the speed of phy and service task is calling
by hclge_get_mac_phy_link, the result of speed setting is uncertain.
Because ethtool cmd will modified phydev and hclge_get_mac_phy_link also
will modified phydev.

Because phy state machine will update phy link periodically, we can
just use phydev->link to check the link status. This patch removes
function call of genphy_read_status. To ensure accuracy, this patch
adds a phy state check. If phy state is not PHY_RUNNING, we consider
link is down. Because in some scenarios, phydev->link may be link up,
but phy state is not PHY_RUNNING. This is just an intermediate state.
In fact, the link is not ready yet.

Fixes: 46a3df9f9718 ("net: hns3: Add HNS3 Acceleration Engine & Compatibility Layer Support")
Signed-off-by: Fuyun Liang <liangfuyun1@...wei.com>
Signed-off-by: Peng Li <lipeng321@...wei.com>
Signed-off-by: Salil Mehta <salil.mehta@...wei.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
index 86523e8993cb9..3bb6181ff0548 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
@@ -2179,7 +2179,7 @@ static int hclge_get_mac_phy_link(struct hclge_dev *hdev)
 	mac_state = hclge_get_mac_link_status(hdev);

 	if (hdev->hw.mac.phydev) {
-		if (!genphy_read_status(hdev->hw.mac.phydev))
+		if (hdev->hw.mac.phydev->state == PHY_RUNNING)
 			link_stat = mac_state &
 				hdev->hw.mac.phydev->link;
 		else
-- 
2.20.1