From 4c2f34ab8315299f8a4e43cb70bf981ef296d7bf Mon Sep 17 00:00:00 2001 From: Antoine Tenart Date: Wed, 19 Sep 2018 11:39:31 +0200 Subject: [PATCH] net: phy: phylink: ensure the carrier is off when starting phylink [ Upstream commit aeeb2e8fdefdd5d257a1446351c70cb3df540199 ] 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 Acked-by: Russell King Signed-off-by: David S. Miller Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- 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 79f28b91..70ce7da 100644 --- a/drivers/net/phy/phylink.c +++ b/drivers/net/phy/phylink.c @@ -747,6 +747,9 @@ 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 advertisment for Serdes links. -- 2.7.4