linux-kernel - [PATCH net-next 3/4] net: netcp: Do not clobber PHY link outside of state machine

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Date:   Mon,  6 Feb 2017 15:55:22 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     netdev@...r.kernel.org
Cc:     zefir.kurtisi@...atec.com, Florian Fainelli <f.fainelli@...il.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Wingman Kwok <w-kwok2@...com>,
        Murali Karicheri <m-karicheri2@...com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        "David S. Miller" <davem@...emloft.net>,
        Philippe Reynes <tremyfr@...il.com>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Jisheng Zhang <jszhang@...vell.com>,
        Jarod Wilson <jarod@...hat.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH net-next 3/4] net: netcp: Do not clobber PHY link outside of state machine

Calling phy_read_status() means that we may call into
genphy_read_status() which in turn will use genphy_update_link() which
can make changes to phydev->link outside of the state machine's state
transitions. This is an invalid behavior that is now caught as off
811a919135b9 ("phy state machine: failsafe leave invalid RUNNING state")

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/net/ethernet/ti/netcp_ethss.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/net/ethernet/ti/netcp_ethss.c b/drivers/net/ethernet/ti/netcp_ethss.c
index f7bb241b17ab..eece3e2eec14 100644
--- a/drivers/net/ethernet/ti/netcp_ethss.c
+++ b/drivers/net/ethernet/ti/netcp_ethss.c
@@ -2313,7 +2313,6 @@ static int gbe_slave_open(struct gbe_intf *gbe_intf)
 		dev_dbg(priv->dev, "phy found: id is: 0x%s\n",
 			phydev_name(slave->phy));
 		phy_start(slave->phy);
-		phy_read_status(slave->phy);
 	}
 	return 0;
 }
@@ -3119,7 +3118,6 @@ static void init_secondary_ports(struct gbe_priv *gbe_dev,
 			dev_dbg(dev, "phy found: id is: 0x%s\n",
 				phydev_name(slave->phy));
 			phy_start(slave->phy);
-			phy_read_status(slave->phy);
 		}
 	}
 }
-- 
2.9.3