From 53013c77437c9b00658fc112b4e0aecd221c512a Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Thu, 11 Dec 2014 12:49:15 -0800 Subject: net: dsa: handle non-existing PHYs on switch internal bus In case there is no PHY at the designated address on the internal switch, we would basically de-reference a null pointer here: dsa_slave_phy_setup(...) { p->phy = ds->slave_mii_bus->phy_map[p->port]; phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link, ^------ This can be triggered when the platform configuration (platform_data or Device Tree) indicates there should be a PHY device at this address, but the HW is non-responsive, such that we cannot attach a PHY device at this specific location. Fix this by checking the return value prior to calling phy_connect_direct(). CC: Andrew Lunn Fixes: b31f65fb4383 ("net: dsa: slave: Fix autoneg for phys on switch MDIO bus") Reported-by: Brian Norris Signed-off-by: Andrey Volkov Signed-off-by: Florian Fainelli Signed-off-by: David S. Miller --- net/dsa/slave.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/dsa/slave.c b/net/dsa/slave.c index 528380a..da64ba9 100644 --- a/net/dsa/slave.c +++ b/net/dsa/slave.c @@ -555,6 +555,9 @@ static void dsa_slave_phy_setup(struct dsa_slave_priv *p, */ if (!p->phy) { p->phy = ds->slave_mii_bus->phy_map[p->port]; + if (!p->phy) + return; + phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link, p->phy_interface); } else { -- cgit v1.1