diff -Naurp linux-2.4.20-pre4-e1000-3/drivers/net/e1000/e1000.h linux-2.4.20-pre4-e1000-4/drivers/net/e1000/e1000.h
--- linux-2.4.20-pre4-e1000-3/drivers/net/e1000/e1000.h	Fri Aug 23 05:52:48 2002
+++ linux-2.4.20-pre4-e1000-4/drivers/net/e1000/e1000.h	Fri Aug 23 06:48:03 2002
@@ -195,5 +195,8 @@ struct e1000_adapter {
 
 
 	uint32_t pci_state[16];
+
+	/* Semaphore for locking HW access vs. i2c-i8254x SMBUS driver */
+	struct semaphore smbus_lock;
 };
 #endif /* _E1000_H_ */
diff -Naurp linux-2.4.20-pre4-e1000-3/drivers/net/e1000/e1000_main.c linux-2.4.20-pre4-e1000-4/drivers/net/e1000/e1000_main.c
--- linux-2.4.20-pre4-e1000-3/drivers/net/e1000/e1000_main.c	Fri Aug 23 05:52:48 2002
+++ linux-2.4.20-pre4-e1000-4/drivers/net/e1000/e1000_main.c	Fri Aug 23 06:48:03 2002
@@ -113,6 +113,7 @@ static char *e1000_strings[] = {
 int e1000_up(struct e1000_adapter *adapter);
 void e1000_down(struct e1000_adapter *adapter);
 void e1000_reset(struct e1000_adapter *adapter);
+void e1000_smbus_lock(struct pci_dev *pdev, boolean_t lock);
 
 static int e1000_init_module(void);
 static void e1000_exit_module(void);
@@ -150,6 +151,8 @@ static void e1000_leave_82542_rst(struct
 static inline void e1000_rx_checksum(struct e1000_adapter *adapter,
                                      struct e1000_rx_desc *rx_desc,
                                      struct sk_buff *skb);
+static boolean_t e1000_smbus_arp_enable(struct e1000_adapter *adapter,
+					boolean_t arp_enable);
 static void e1000_tx_timeout(struct net_device *dev);
 
 static void e1000_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp);
@@ -191,6 +194,10 @@ MODULE_AUTHOR("Intel Corporation, <linux
 MODULE_DESCRIPTION("Intel(R) PRO/1000 Network Driver");
 MODULE_LICENSE("GPL");
 
+#ifdef EXPORT_SYMTAB
+EXPORT_SYMBOL(e1000_smbus_lock);
+#endif
+
 /**
  * e1000_init_module - Driver Registration Routine
  *
@@ -288,7 +295,9 @@ e1000_reset(struct e1000_adapter *adapte
 		E1000_WRITE_REG(&adapter->hw, PBA, E1000_DEFAULT_PBA);
 
 	adapter->hw.fc = adapter->hw.original_fc;
+	down(&adapter->smbus_lock);
 	e1000_reset_hw(&adapter->hw);
+	up(&adapter->smbus_lock);
 	if(adapter->hw.mac_type >= e1000_82544)
 		E1000_WRITE_REG(&adapter->hw, WUC, 0);
 	e1000_init_hw(&adapter->hw);
@@ -490,16 +499,9 @@ e1000_remove(struct pci_dev *pdev)
 {
 	struct net_device *netdev = pci_get_drvdata(pdev);
 	struct e1000_adapter *adapter = netdev->priv;
-	uint32_t manc;
-	
-	if(adapter->hw.mac_type >= e1000_82540) {
-		manc = E1000_READ_REG(&adapter->hw, MANC);
-		if(manc & E1000_MANC_SMBUS_EN) {
-			manc |= E1000_MANC_ARP_EN;
-			E1000_WRITE_REG(&adapter->hw, MANC, manc);
-		}
-	}
-		
+
+	e1000_smbus_arp_enable(adapter, TRUE);
+
 	unregister_netdev(netdev);
 
 	e1000_phy_hw_reset(&adapter->hw);
@@ -623,6 +625,7 @@ e1000_sw_init(struct e1000_adapter *adap
 
 	atomic_set(&adapter->irq_sem, 1);
 	spin_lock_init(&adapter->stats_lock);
+	init_MUTEX(&adapter->smbus_lock);
 }
 
 /**
@@ -2141,7 +2144,7 @@ e1000_suspend(struct pci_dev *pdev, uint
 {
 	struct net_device *netdev = pci_get_drvdata(pdev);
 	struct e1000_adapter *adapter = netdev->priv;
-	uint32_t ctrl, ctrl_ext, rctl, manc;
+	uint32_t ctrl, ctrl_ext, rctl;
 
 	netif_device_detach(netdev);
 
@@ -2180,13 +2183,7 @@ e1000_suspend(struct pci_dev *pdev, uint
 
 	pci_save_state(pdev, adapter->pci_state);
 
-	if(adapter->hw.mac_type >= e1000_82540) {
-		manc = E1000_READ_REG(&adapter->hw, MANC);
-		if(manc & E1000_MANC_SMBUS_EN) {
-			manc |= E1000_MANC_ARP_EN;
-			E1000_WRITE_REG(&adapter->hw, MANC, manc);
-		}
-	} else
+	if(!e1000_smbus_arp_enable(adapter, TRUE))
 		pci_set_power_state(pdev, 3);
 
 	return 0;
@@ -2198,7 +2195,6 @@ e1000_resume(struct pci_dev *pdev)
 {
 	struct net_device *netdev = pci_get_drvdata(pdev);
 	struct e1000_adapter *adapter = netdev->priv;
-	uint32_t manc;
 
 	pci_set_power_state(pdev, 0);
 	pci_restore_state(pdev, adapter->pci_state);
@@ -2213,14 +2209,53 @@ e1000_resume(struct pci_dev *pdev)
 
 	netif_device_attach(netdev);
 
-	if(adapter->hw.mac_type >= e1000_82540) {
-		manc = E1000_READ_REG(&adapter->hw, MANC);
-		manc &= ~(E1000_MANC_ARP_EN);
-		E1000_WRITE_REG(&adapter->hw, MANC, manc);
-	}
+	e1000_smbus_arp_enable(adapter, FALSE);
 
 	return 0;
 }
 #endif
 
+/**
+ * e1000_smbus_lock - Exported for lock/unlock external smbus hw access
+ * @pdev: PCI device information struct
+ * @lock: TRUE to lock hw access; FALSE to unlock
+ *
+ * e1000_smbus_lock is designed to allow synchronization between e1000
+ * driver and i2c-i8254x SMBUS bus driver when accessing e1000 hardware
+ **/
+void
+e1000_smbus_lock(struct pci_dev *pdev, boolean_t lock)
+{
+	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct e1000_adapter *adapter = netdev->priv;
+
+	if (lock)
+		down(&adapter->smbus_lock);
+	else
+		up(&adapter->smbus_lock);
+}
+
+static boolean_t
+e1000_smbus_arp_enable(struct e1000_adapter *adapter, boolean_t arp_enable)
+{
+	uint32_t manc;
+	boolean_t ret_val = FALSE;
+
+	if(adapter->hw.mac_type < e1000_82540)
+		return ret_val;
+
+	down(&adapter->smbus_lock);
+	manc = E1000_READ_REG(&adapter->hw, MANC);
+	if(!arp_enable) {
+		manc &= ~(E1000_MANC_ARP_EN);
+	} else if(manc & E1000_MANC_SMBUS_EN) {
+		manc |= E1000_MANC_ARP_EN;
+		ret_val = TRUE;
+	}
+	E1000_WRITE_REG(&adapter->hw, MANC, manc);
+	up(&adapter->smbus_lock);
+
+	return ret_val;
+}
+
 /* e1000_main.c */

.