From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756915AbcBIPWM (ORCPT ); Tue, 9 Feb 2016 10:22:12 -0500 Received: from mail-lb0-f196.google.com ([209.85.217.196]:36425 "EHLO mail-lb0-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756619AbcBIPVK (ORCPT ); Tue, 9 Feb 2016 10:21:10 -0500 From: Alexander Kochetkov To: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, "'David S. Miller'" , Alexander Kochetkov Subject: [PATCH 2/3] net: arc_emac: reset txbd_curr and txbd_dirty pointers to zero Date: Tue, 9 Feb 2016 18:20:39 +0300 Message-Id: <1455031240-29385-3-git-send-email-al.kochet@gmail.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1455031240-29385-1-git-send-email-al.kochet@gmail.com> References: <1455031240-29385-1-git-send-email-al.kochet@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org EMAC reset internal tx ring pointer to zero at statup. txbd_curr and txbd_dirty can be different from zero. That cause ethernet transfer hang (no packets transmitted). In order to reproduce, run on device: ifconfig eth0 down ifconfig eth0 up Signed-off-by: Alexander Kochetkov --- CC: stable@vger.kernel.org # 3.18.x- --- drivers/net/ethernet/arc/emac_main.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/ethernet/arc/emac_main.c b/drivers/net/ethernet/arc/emac_main.c index 63a63e3..4f6e5be 100644 --- a/drivers/net/ethernet/arc/emac_main.c +++ b/drivers/net/ethernet/arc/emac_main.c @@ -447,6 +447,9 @@ static int arc_emac_open(struct net_device *ndev) *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; } + priv->txbd_curr = 0; + priv->txbd_dirty = 0; + /* Clean Tx BD's */ memset(priv->txbd, 0, TX_RING_SZ); -- 1.7.9.5