--- old_kernel/drivers/net/gianfar.c	2005-06-21 10:57:29.000000000 +0900
+++ new_kernel/drivers/net/gianfar.c	2005-09-26 17:05:46.116951768 +0900
@@ -541,6 +541,14 @@
 				MII_INTERRUPT_DISABLED);
 	}
 
+/* following 2 steps is a attempting to prevent system hanging/panic
+   when executing ifconfig command. by Sun Zhitai, Sep. 26 2005 */ 
+
+	cancel_delayed_work(&priv->tq);
+	del_timer_sync(&priv->phy_info_timer);
+
+/* appended end */
+
 	spin_unlock_irqrestore(&priv->lock, flags);
 
 	/* Free the IRQs */
@@ -770,7 +778,7 @@
 	init_timer(&priv->phy_info_timer);
 	priv->phy_info_timer.function = &gfar_phy_startup_timer;
 	priv->phy_info_timer.data = (unsigned long) priv->mii_info;
-	mod_timer(&priv->phy_info_timer, jiffies + HZ);
+	__mod_timer(&priv->phy_info_timer, jiffies + HZ);
 
 	/* Configure the coalescing support */
 	if (priv->txcoalescing)
@@ -1500,7 +1508,7 @@
 
 	schedule_work(&priv->tq);
 
-	mod_timer(&priv->phy_info_timer, jiffies +
+	__mod_timer(&priv->phy_info_timer, jiffies +
 			GFAR_PHY_CHANGE_TIME * HZ);
 }
 
@@ -1523,7 +1531,7 @@
 	/* If autonegotiation failed to start, and
 	 * we haven't timed out, reset the timer, and return */
 	if (result && secondary--) {
-		mod_timer(&priv->phy_info_timer, jiffies + HZ);
+		__mod_timer(&priv->phy_info_timer, jiffies + HZ);
 		return;
 	} else if (result) {
 		/* Couldn't start autonegotiation.
@@ -1564,7 +1572,7 @@
 	init_timer(&priv->phy_info_timer);
 	priv->phy_info_timer.function = &gfar_phy_timer;
 	priv->phy_info_timer.data = (unsigned long) mii_info->dev;
-	mod_timer(&priv->phy_info_timer, jiffies +
+	__mod_timer(&priv->phy_info_timer, jiffies +
 			GFAR_PHY_CHANGE_TIME * HZ);
 }