From: Vladimir Oltean Date: Thu, 27 Jun 2019 21:46:35 +0000 (+0300) Subject: net: dsa: sja1105: Don't check state->link in phylink_mac_config X-Git-Tag: tags/kvm-5.3-2~55^2~116^2~2 X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=a979a0ab3687f701ef3a8223cbb56ce993a767fb;p=users%2Fdwmw2%2Flinux.git net: dsa: sja1105: Don't check state->link in phylink_mac_config It has been pointed out that PHYLINK can call mac_config only to update the phy_interface_type and without knowing what the AN results are. Experimentally, when this was observed to happen, state->link was also unset, and therefore was used as a proxy to ignore this call. However it is also suggested that state->link is undefined for this callback and should not be relied upon. So let the previously-dead codepath for SPEED_UNKNOWN be called, and update the comment to make sure the MAC's behavior is sane. Cc: Russell King Signed-off-by: Vladimir Oltean Signed-off-by: David S. Miller --- diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c index caebf76eaa3e7..da1736093b063 100644 --- a/drivers/net/dsa/sja1105/sja1105_main.c +++ b/drivers/net/dsa/sja1105/sja1105_main.c @@ -715,7 +715,13 @@ static int sja1105_adjust_port_config(struct sja1105_private *priv, int port, switch (speed_mbps) { case SPEED_UNKNOWN: - /* No speed update requested */ + /* PHYLINK called sja1105_mac_config() to inform us about + * the state->interface, but AN has not completed and the + * speed is not yet valid. UM10944.pdf says that setting + * SJA1105_SPEED_AUTO at runtime disables the port, so that is + * ok for power consumption in case AN will never complete - + * otherwise PHYLINK should come back with a new update. + */ speed = SJA1105_SPEED_AUTO; break; case SPEED_10: @@ -766,9 +772,6 @@ static void sja1105_mac_config(struct dsa_switch *ds, int port, { struct sja1105_private *priv = ds->priv; - if (!state->link) - return; - sja1105_adjust_port_config(priv, port, state->speed); }