Index: ciss.c
===================================================================
RCS file: /home/ncvs/src/sys/dev/ciss/ciss.c,v
retrieving revision 1.81
diff -u -r1.81 ciss.c
--- ciss.c	17 Jun 2007 05:55:49 -0000	1.81
+++ ciss.c	29 Sep 2007 07:30:23 -0000
@@ -3067,6 +3067,9 @@
 ciss_periodic(void *arg)
 {
     struct ciss_softc	*sc;
+    struct ciss_request	*cr = NULL;
+    struct ciss_command	*cc = NULL;
+    int			error = 0;
 
     debug_called(1);
 
@@ -3090,6 +3093,29 @@
     }
 
     /*
+     * Send the NOP message and wait for a response.
+     */
+    if ((error = ciss_get_request(sc, &cr)) != 0) {
+	goto out;
+    }
+
+    cc = CISS_FIND_COMMAND(cr);
+    cc->cdb.cdb_length = 1;
+    cc->cdb.type = CISS_CDB_TYPE_MESSAGE;
+    cc->cdb.attribute = CISS_CDB_ATTRIBUTE_SIMPLE;
+    cc->cdb.direction = CISS_CDB_DIRECTION_WRITE;
+    cc->cdb.timeout = 0;
+    cc->cdb.cdb[0] = CISS_OPCODE_MESSAGE_NOP;
+
+    if ((error = ciss_synch_request(cr, 10 * 1000)) != 0) {
+	ciss_printf(sc, "SENDING NOP MESSAGE FAILED\n");
+	/* XXX should reset adapter here */
+	goto out;
+    }
+
+    ciss_release_request(cr);
+
+    /*
      * If the notify event request has died for some reason, or has
      * not started yet, restart it.
      */
@@ -3102,6 +3128,14 @@
      * Reschedule.
      */
     callout_reset(&sc->ciss_periodic, CISS_HEARTBEAT_RATE * hz, ciss_periodic, sc);
+
+    return;
+
+out:
+    ciss_printf(sc, "abort ciss_periodic() on error (%d)\n", error);
+    if (cr != NULL) {
+	ciss_release_request(cr);
+    }
 }
 
 /************************************************************************