mv643xx(18/20): Isolate the PHY at device close

["Dale Farnsworth" <dale@xxxxxxxxxxxxxx>]

Signed-off-by: James Chapman <jchapman@xxxxxxxxxxx>
Acked-by: Dale Farnsworth <dale@xxxxxxxxxxxxxx>

Index: linux-2.5-enet/drivers/net/mv643xx_eth.c
===================================================================
--- linux-2.5-enet.orig/drivers/net/mv643xx_eth.c
+++ linux-2.5-enet/drivers/net/mv643xx_eth.c
@@ -591,6 +591,12 @@
        mv643xx_eth_write_smi_reg(dev, MII_BMCR, phy_reg_data | BMCR_RESET);
 }
 
+static void mv643xx_eth_phy_isolate(struct net_device *dev)
+{
+       /* Isolate the PHY (force link down) */
+       mv643xx_eth_write_smi_reg(dev, MII_BMCR, BMCR_PDOWN | BMCR_ISOLATE);
+}
+
 /*
  * This function prepares the ethernet port to start its activity:
  * 1) Completes the ethernet port driver struct initialization toward port
@@ -2210,6 +2216,9 @@
 
        mv643xx_eth_real_stop(dev);
 
+       /* Isolate the PHY from the network (force link down) */
+       mv643xx_eth_phy_isolate(dev);
+
        free_irq(dev->irq, dev);
        spin_unlock_irq(&mp->lock);