igb: Fix panic with NICs with 1000BASE-SX PHY

This patch eliminates a kernel panic with the igb driver in 2.6.25-rc2 when
running on a Intel 82575 Ethernet controller with a 1000BASE-SX PHY.  The
panic does not happen with the 1000BASE-T PHY, only with a SX connection.

Signed-off-by: Bill Hayes <bill.hayes@hp.com>
Signed-off-by: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/igb/igb_main.c

@@ -816,7 +816,8 @@ void igb_reset(struct igb_adapter *adapter)
 	wr32(E1000_VET, ETHERNET_IEEE_VLAN_TYPE);
 
 	igb_reset_adaptive(&adapter->hw);
-	adapter->hw.phy.ops.get_phy_info(&adapter->hw);
+	if (adapter->hw.phy.ops.get_phy_info)
+		adapter->hw.phy.ops.get_phy_info(&adapter->hw);
 }
 
 /**
@@ -2052,7 +2053,8 @@ static void igb_set_multi(struct net_device *netdev)
 static void igb_update_phy_info(unsigned long data)
 {
 	struct igb_adapter *adapter = (struct igb_adapter *) data;
-	adapter->hw.phy.ops.get_phy_info(&adapter->hw);
+	if (adapter->hw.phy.ops.get_phy_info)
+		adapter->hw.phy.ops.get_phy_info(&adapter->hw);
 }
 
 /**