From mboxrd@z Thu Jan 1 00:00:00 1970 From: Fugang Duan Subject: [PATCH] net: fec: fix the error to get the previous BD entry Date: Fri, 30 Aug 2013 12:35:25 +0800 Message-ID: <1377837325-5232-1-git-send-email-B38611@freescale.com> Mime-Version: 1.0 Content-Type: text/plain Cc: , , , To: , Return-path: Received: from co9ehsobe001.messaging.microsoft.com ([207.46.163.24]:24703 "EHLO co9outboundpool.messaging.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756364Ab3H3Emo (ORCPT ); Fri, 30 Aug 2013 00:42:44 -0400 Sender: netdev-owner@vger.kernel.org List-ID: When the current BD is the first BD, the previous BD entry must be the last BD, not "bdp - 1". Add BD entry check to get the previous BD entry correctly. Signed-off-by: Fugang Duan --- drivers/net/ethernet/freescale/fec_main.c | 10 +++++++++- 1 files changed, 9 insertions(+), 1 deletions(-) diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c index 4ea1555..b13746f 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -380,7 +380,15 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev) } } - bdp_pre = fec_enet_get_prevdesc(bdp, fep->bufdesc_ex); + if (bdp == fep->tx_bd_base) { + if (fep->bufdesc_ex) + bdp_pre = (struct bufdesc *)((void *)bdp + + (sizeof(struct bufdesc_ex) * (TX_RING_SIZE - 1))); + else + bdp_pre = bdp + TX_RING_SIZE - 1; + } else { + bdp_pre = fec_enet_get_prevdesc(bdp, fep->bufdesc_ex); + } if ((id_entry->driver_data & FEC_QUIRK_ERR006358) && !(bdp_pre->cbd_sc & BD_ENET_TX_READY)) { fep->delay_work.trig_tx = true; -- 1.7.1