gianfar: Reduce logging noise seen due to phy polling if link is down

Commit 6ce29b0e2a04 ("gianfar: Avoid unnecessary reg accesses in adjust_link()")
eliminates unnecessary calls to adjust_link for phy devices which don't support
interrupts and need polling. As part of that work, the 'new_state' local flag,
which was used to reduce logging noise on the console, was eliminated.

Unfortunately, that means that a 'Link is Down' log message will now be
issued continuously if a link is configured as UP, the link state is down,
and the associated phy requires polling. This occurs because priv->oldduplex
is -1 in this case, which always differs from phydev->duplex. In addition,
phydev->speed may also differ from priv->oldspeed.  gfar_update_link_state()
is therefore called each time a phy is polled, even if the link state did not
change.

Cc: Claudiu Manoil <claudiu.manoil@freescale.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Claudiu Manoil <claudiu.manoil@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
index 43df78882e484e065706bd04c322fa8276d4c424..178e54028d1047eab23af38ba970303bc0cad357 100644 (file)
--- a/drivers/net/ethernet/freescale/gianfar.c
+++ b/drivers/net/ethernet/freescale/gianfar.c
@@ -3162,8 +3162,8 @@ static void adjust_link(struct net_device *dev)
        struct phy_device *phydev = priv->phydev;
 
        if (unlikely(phydev->link != priv->oldlink ||
-                    phydev->duplex != priv->oldduplex ||
-                    phydev->speed != priv->oldspeed))
+                    (phydev->link && (phydev->duplex != priv->oldduplex ||
+                                      phydev->speed != priv->oldspeed))))
                gfar_update_link_state(priv);
 }