--- a/master/ethernet.c	Fri May 12 12:38:22 2006 +0000
+++ b/master/ethernet.c	Fri May 12 12:40:45 2006 +0000
@@ -263,6 +263,18 @@
 /*****************************************************************************/
 
 /**
+   Returns the state of the device.
+   \return 1 if the device is "up", 0 if it is "down"
+*/
+
+unsigned int ec_eoe_active(const ec_eoe_t *eoe /**< EoE object */)
+{
+    return eoe->opened;
+}
+
+/*****************************************************************************/
+
+/**
    Prints EoE object information.
 */
 

--- a/master/ethernet.h	Fri May 12 12:38:22 2006 +0000
+++ b/master/ethernet.h	Fri May 12 12:40:45 2006 +0000
@@ -66,7 +66,7 @@
     void (*state)(ec_eoe_t *); /**< state function for the state machine */
     struct net_device *dev; /**< net_device for virtual ethernet device */
     struct net_device_stats stats; /**< device statistics */
-    uint8_t opened; /**< net_device is opened */
+    unsigned int opened; /**< net_device is opened */
     struct sk_buff *rx_skb; /**< current rx socket buffer */
     off_t rx_skb_offset; /**< current write pointer in the socket buffer */
     size_t rx_skb_size; /**< size of the allocated socket buffer memory */
@@ -86,6 +86,7 @@
 int ec_eoe_init(ec_eoe_t *, ec_slave_t *);
 void ec_eoe_clear(ec_eoe_t *);
 void ec_eoe_run(ec_eoe_t *);
+unsigned int ec_eoe_active(const ec_eoe_t *);
 void ec_eoe_print(const ec_eoe_t *);
 
 /*****************************************************************************/

--- a/master/master.c	Fri May 12 12:38:22 2006 +0000
+++ b/master/master.c	Fri May 12 12:40:45 2006 +0000
@@ -874,9 +874,14 @@
 {
     ec_master_t *master = (ec_master_t *) data;
     ec_eoe_t *eoe;
+    unsigned int active = 0;
+
+    list_for_each_entry(eoe, &master->eoe_slaves, list) {
+        if (ec_eoe_active(eoe)) active++;
+    }
 
     // request_cb must return 0, if the lock has been aquired!
-    if (!master->request_cb(master->cb_data))
+    if (active && !master->request_cb(master->cb_data))
     {
         ecrt_master_async_receive(master);
         list_for_each_entry(eoe, &master->eoe_slaves, list) {