diff -r af21f0bdc7c9 -r 2b9c78543663 devices/e1000/e1000_main-2.6.20-ethercat.c
--- a/devices/e1000/e1000_main-2.6.20-ethercat.c	Thu Sep 06 14:21:02 2012 +0200
+++ b/devices/e1000/e1000_main-2.6.20-ethercat.c	Mon Nov 03 15:20:05 2014 +0100
@@ -23,7 +23,7 @@
   Linux NICS <linux.nics@intel.com>
   e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
-  
+
   vim: noexpandtab
 
 *******************************************************************************/
@@ -1190,7 +1190,8 @@
 	// offer device to EtherCAT master module
 	adapter->ecdev = ecdev_offer(netdev, ec_poll, THIS_MODULE);
 	if (adapter->ecdev) {
-		if (ecdev_open(adapter->ecdev)) {
+		err = ecdev_open(adapter->ecdev);
+		if (err) {
 			ecdev_withdraw(adapter->ecdev);
 			goto err_register;
 		}
@@ -2403,7 +2404,7 @@
 		/* No need to loop, because 82542 supports only 1 queue */
 		struct e1000_rx_ring *ring = &adapter->rx_ring[0];
 		e1000_configure_rx(adapter);
-		if (adapter->ecdev) { 
+		if (adapter->ecdev) {
 			/* fill rx ring completely! */
 			adapter->alloc_rx_buf(adapter, ring, ring->count);
 		} else {
@@ -3300,6 +3301,10 @@
 	struct e1000_adapter *adapter = netdev_priv(netdev);
 	struct e1000_tx_ring *tx_ring = adapter->tx_ring;
 
+	if (adapter->ecdev) {
+		return -EBUSY;
+	}
+
 	netif_stop_queue(netdev);
 	/* Herbert's original patch had:
 	 *  smp_mb__after_netif_stop_queue();