drivers: netdev2: rename isr_arg

drivers/include/net/netdev2.h

@@ -101,11 +101,14 @@ typedef void (*netdev2_event_cb_t)(netdev2_t *dev, netdev2_event_t event);
  *
  * Supposed to be extended by driver implementations.
  * The extended structure should contain all variable driver state.
+ *
+ * Contains a field @p context which is not used by the drivers, but supposed to
+ * be used by upper layers to store reference information.
  */
 struct netdev2 {
     const struct netdev2_driver *driver;    /**< ptr to that driver's interface. */
     netdev2_event_cb_t event_callback;      /**< callback for device events */
-    void *isr_arg;                          /**< argument to pass on isr event */
+    void* context;                          /**< ptr to network stack context */
 #ifdef MODULE_NETSTATS_L2
     netstats_t stats;                       /**< transceiver's statistics */
 #endif

sys/net/gnrc/link_layer/netdev2/gnrc_netdev2.c

@@ -48,7 +48,7 @@ static void _pass_on_packet(gnrc_pktsnip_t *pkt);
  */
 static void _event_cb(netdev2_t *dev, netdev2_event_t event)
 {
-    gnrc_netdev2_t *gnrc_netdev2 = (gnrc_netdev2_t*) dev->isr_arg;
+    gnrc_netdev2_t *gnrc_netdev2 = (gnrc_netdev2_t*) dev->context;
 
     if (event == NETDEV2_EVENT_ISR) {
         msg_t msg;
@@ -122,7 +122,7 @@ static void *_gnrc_netdev2_thread(void *args)
 
     /* register the event callback with the device driver */
     dev->event_callback = _event_cb;
-    dev->isr_arg = (void*) gnrc_netdev2;
+    dev->context = (void*) gnrc_netdev2;
 
     /* register the device to the network stack*/
     gnrc_netif_add(thread_getpid());