From e0f0bd7be5bb2f7473c5554b4013cb1d140e0d92 Mon Sep 17 00:00:00 2001
From: Brad Smith <brad@cvs.openbsd.org>
Date: Mon, 30 Jan 2006 00:32:46 +0000
Subject: only flush the TX descriptors in re_start() if there are packets to
 be transmitted.

tested by jsg@
---
 sys/dev/ic/re.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'sys')

diff --git a/sys/dev/ic/re.c b/sys/dev/ic/re.c
index 21b48cda9b6..e610bcf6a27 100644
--- a/sys/dev/ic/re.c
+++ b/sys/dev/ic/re.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: re.c,v 1.16 2006/01/28 02:15:19 brad Exp $	*/
+/*	$OpenBSD: re.c,v 1.17 2006/01/30 00:32:45 brad Exp $	*/
 /*	$FreeBSD: if_re.c,v 1.31 2004/09/04 07:54:05 ru Exp $	*/
 /*
  * Copyright (c) 1997, 1998-2003
@@ -1491,7 +1491,7 @@ re_start(ifp)
 {
 	struct rl_softc	*sc;
 	struct mbuf		*m_head = NULL;
-	int			idx;
+	int			idx, queued = 0;
 
 	sc = ifp->if_softc;
 
@@ -1514,8 +1514,12 @@ re_start(ifp)
 		if (ifp->if_bpf)
 			bpf_mtap(ifp->if_bpf, m_head);
 #endif
+		queued++;
 	}
 
+	if (queued == 0)
+		return;
+
 	/* Flush the TX descriptors */
 
 	bus_dmamap_sync(sc->sc_dmat,
-- 
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