tg3: Fix link check in tg3_adjust_link

The tg3 driver tried to detect link changes by comparing the tg3 local
active_speed member with SPEED_UNKNOWN (or formerly SPEED_INVALID).
This check is not correct, since phylib will never set its speed member
to either of these two values.  The code only appeared to work because
tg3 initializes active_speed to SPEED_INVALID during tg3_init_one.  This
patch introduces a new "old_link" tg3 member and then compares the
phy_device's link member against it to detect link state changes.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 27dafd9..0caf565 100644 (file)
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -1819,13 +1819,13 @@ static void tg3_adjust_link(struct net_device *dev)
                      (6 << TX_LENGTHS_IPG_SHIFT) |
                      (32 << TX_LENGTHS_SLOT_TIME_SHIFT)));
 
-       if ((phydev->link && tp->link_config.active_speed == SPEED_UNKNOWN) ||
-           (!phydev->link && tp->link_config.active_speed != SPEED_UNKNOWN) ||
+       if (phydev->link != tp->old_link ||
            phydev->speed != tp->link_config.active_speed ||
            phydev->duplex != tp->link_config.active_duplex ||
            oldflowctrl != tp->link_config.active_flowctrl)
                linkmesg = 1;
 
+       tp->old_link = phydev->link;
        tp->link_config.active_speed = phydev->speed;
        tp->link_config.active_duplex = phydev->duplex;
 
@@ -13352,6 +13352,8 @@ static void __devinit tg3_phy_init_link_config(struct tg3 *tp)
        tp->link_config.autoneg = AUTONEG_ENABLE;
        tp->link_config.active_speed = SPEED_UNKNOWN;
        tp->link_config.active_duplex = DUPLEX_UNKNOWN;
+
+       tp->old_link = -1;
 }
 
 static int __devinit tg3_phy_probe(struct tg3 *tp)

diff --git a/drivers/net/ethernet/broadcom/tg3.h b/drivers/net/ethernet/broadcom/tg3.h
index 22cbe74..66bcfca 100644 (file)
--- a/drivers/net/ethernet/broadcom/tg3.h
+++ b/drivers/net/ethernet/broadcom/tg3.h
@@ -3064,6 +3064,7 @@ struct tg3 {
 
        struct mii_bus                  *mdio_bus;
        int                             mdio_irq[PHY_MAX_ADDR];
+       int                             old_link;
 
        u8                              phy_addr;