linux-kernel - [PATCH net-next 1/3] net: phy: phylink: ensure the carrier is off when starting phylink

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Message-Id: <20180919093933.24411-2-antoine.tenart@bootlin.com>
Date:   Wed, 19 Sep 2018 11:39:31 +0200
From:   Antoine Tenart <antoine.tenart@...tlin.com>
To:     davem@...emloft.net, linux@...linux.org.uk, andrew@...n.ch,
        f.fainelli@...il.com
Cc:     Antoine Tenart <antoine.tenart@...tlin.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        thomas.petazzoni@...tlin.com, maxime.chevallier@...tlin.com,
        gregory.clement@...tlin.com, miquel.raynal@...tlin.com,
        nadavh@...vell.com, stefanc@...vell.com, ymarkman@...vell.com,
        mw@...ihalf.com
Subject: [PATCH net-next 1/3] net: phy: phylink: ensure the carrier is off when starting phylink

Phylink made an assumption about the carrier state being down when
calling phylink_start(). If this assumption isn't satisfied, the
internal phylink state could misbehave and a net device could end up not
being functional.

This patch fixes this by explicitly calling netif_carrier_off() in
phylink_start().

Signed-off-by: Antoine Tenart <antoine.tenart@...tlin.com>
---
 drivers/net/phy/phylink.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 3ba5cf2a8a5f..1d01e0c625a5 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -901,6 +901,9 @@ void phylink_start(struct phylink *pl)
 		    phylink_an_mode_str(pl->link_an_mode),
 		    phy_modes(pl->link_config.interface));
 
+	/* Always set the carrier off */
+	netif_carrier_off(pl->netdev);
+
 	/* Apply the link configuration to the MAC when starting. This allows
 	 * a fixed-link to start with the correct parameters, and also
 	 * ensures that we set the appropriate advertisement for Serdes links.
-- 
2.17.1