diff -r aa0f6f939cb3 -r ca345abf0565 devices/r8169-2.6.28-ethercat.c
--- a/devices/r8169-2.6.28-ethercat.c	Tue Apr 10 19:09:51 2012 +0200
+++ b/devices/r8169-2.6.28-ethercat.c	Tue Apr 10 19:10:56 2012 +0200
@@ -3858,7 +3858,7 @@
 	void __iomem *ioaddr = tp->mmio_addr;
 
 	if (tp->ecdev)
-		return;
+		return -EBUSY;
 
 	if (!netif_running(dev))
 		goto out_pci_suspend;
@@ -3889,7 +3889,7 @@
 	struct rtl8169_private *tp = netdev_priv(dev);
 
 	if (tp->ecdev)
-		return;
+		return -EBUSY;
 
 	pci_set_power_state(pdev, PCI_D0);
 	pci_restore_state(pdev);