PERFORCE change 170157 for review

[Alexander Motin]

http://p4web.freebsd.org/chv.cgi?CH=170157

Change 170157 by mav at mav_mavtest on 2009/11/04 12:10:45

	If several controllers complete requests same time, call swi_sched()
	only once.

Affected files ...

.. //depot/projects/scottl-camlock/src/sys/cam/cam_xpt.c#120 edit

Differences ...

==== //depot/projects/scottl-camlock/src/sys/cam/cam_xpt.c#120 (text+ko) ====

@@ -4238,6 +4238,7 @@
 xpt_done(union ccb *done_ccb)
 {
 	struct cam_sim *sim;
+	int	first;
 
 	CAM_DEBUG(done_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xpt_done\n"));
 	if ((done_ccb->ccb_h.func_code & XPT_FC_QUEUED) != 0) {
@@ -4251,10 +4252,12 @@
 		done_ccb->ccb_h.pinfo.index = CAM_DONEQ_INDEX;
 		if ((sim->flags & CAM_SIM_ON_DONEQ) == 0) {
 			mtx_lock(&cam_simq_lock);
+			first = TAILQ_EMPTY(&cam_simq);
 			TAILQ_INSERT_TAIL(&cam_simq, sim, links);
 			mtx_unlock(&cam_simq_lock);
 			sim->flags |= CAM_SIM_ON_DONEQ;
-			swi_sched(cambio_ih, 0);
+			if (first)
+				swi_sched(cambio_ih, 0);
 		}
 	}
 }