Index: if_em.c
===================================================================
RCS file: /private/FreeBSD/src/sys/dev/em/if_em.c,v
retrieving revision 1.61
diff -u -p -r1.61 if_em.c
--- if_em.c	4 Feb 2005 18:36:04 -0000	1.61
+++ if_em.c	17 Feb 2005 14:59:56 -0000
@@ -2766,11 +2766,14 @@ em_process_receive_interrupts(struct ada
  	u_int8_t            eop = 0;
 	u_int16_t           len, desc_len, prev_len_adj;
 	int                 i;
+	static int          busy = 0;
 
 	/* Pointer to the receive descriptor being examined. */
 	struct em_rx_desc   *current_desc;
 
 	mtx_assert(&adapter->mtx, MA_OWNED);
+	if (busy)
+		return;
 
 	ifp = &adapter->interface_data.ac_if;
 	i = adapter->next_rx_desc_to_check;
@@ -2894,9 +2897,11 @@ em_process_receive_interrupts(struct ada
 						       adapter->fmp = NULL);
  
                                 if (adapter->fmp != NULL) {
+					busy = 1;
 					EM_UNLOCK(adapter);
                                         (*ifp->if_input)(ifp, adapter->fmp);
 					EM_LOCK(adapter);
+					busy = 0;
 				}
 #endif
                                 adapter->fmp = NULL;