4.19-stable review patch. If anyone has any objections, please let me know.
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From: Antoine Tenart antoine.tenart@bootlin.com
[ 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 antoine.tenart@bootlin.com Acked-by: Russell King rmk+kernel@armlinux.org.uk Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/phy/phylink.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/net/phy/phylink.c +++ b/drivers/net/phy/phylink.c @@ -907,6 +907,9 @@ 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.