[e1000 2.6-exp] back out CSA interrupt fix

["Feldman, Scott" <scott.feldman@xxxxxxxxx>]

* 8086:1019 82547 CSA-based LOMs lock up the system with
  this code, so let's revert back to what's in 2.6.0 until
  we can figure out why this is causing problems.

---------

--- net-drivers-2.5-exp/drivers/net/e1000/e1000_main.c.orig     2004-01-04 
15:58:59.000000000 -0800
+++ net-drivers-2.5-exp/drivers/net/e1000/e1000_main.c  2004-01-04 
15:59:32.000000000 -0800
@@ -2097,26 +2097,10 @@
                __netif_rx_schedule(netdev);
        }
 #else
-        /* Writing IMC and IMS is needed for 82547.
-          Due to Hub Link bus being occupied, an interrupt 
-          de-assertion message is not able to be sent. 
-          When an interrupt assertion message is generated later,
-          two messages are re-ordered and sent out.
-          That causes APIC to think 82547 is in de-assertion
-          state, while 82547 is in assertion state, resulting 
-          in dead lock. Writing IMC forces 82547 into 
-          de-assertion state.
-        */
-       if(hw->mac_type == e1000_82547 || hw->mac_type == e1000_82547_rev_2)
-               e1000_irq_disable(adapter);
-
        for(i = 0; i < E1000_MAX_INTR; i++)
                if(!e1000_clean_rx_irq(adapter) &
                   !e1000_clean_tx_irq(adapter))
                        break;
-
-       if(hw->mac_type == e1000_82547 || hw->mac_type == e1000_82547_rev_2)
-               e1000_irq_enable(adapter);
 #endif
 
        return IRQ_HANDLED;