netdev - [PATCH] gianfar: fix the last transmit buffer descriptor

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Date:	Thu, 2 Jun 2016 17:36:28 +0800
From:	Yangbo Lu <yangbo.lu@....com>
To:	<netdev@...r.kernel.org>
CC:	Claudiu Manoil <claudiu.manoil@...escale.com>,
	Yangbo Lu <yangbo.lu@....com>
Subject: [PATCH] gianfar: fix the last transmit buffer descriptor

When the transmit hardware timestamping is enabled, an additional
TxBD would be added and would be set as the last TxBD with TXBD_LAST
and TXBD_INTERRUPT. However this has been broken by a patch recently.
This made the software couldn't get transmit hardware timestamps and
resulted in call trace. So, this patch is to fix this issue.

Fixes: 48963b4492e9 ("gianfar: Remove redundant ops for do_tstamp
       from xmit()")
Signed-off-by: Yangbo Lu <yangbo.lu@....com>
---
 drivers/net/ethernet/freescale/gianfar.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
index 7615e06..2e6785b 100644
--- a/drivers/net/ethernet/freescale/gianfar.c
+++ b/drivers/net/ethernet/freescale/gianfar.c
@@ -2440,7 +2440,8 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
 						 tx_queue->tx_ring_size);
 
 	if (likely(!nr_frags)) {
-		lstatus |= BD_LFLAG(TXBD_LAST | TXBD_INTERRUPT);
+		if (likely(!do_tstamp))
+			lstatus |= BD_LFLAG(TXBD_LAST | TXBD_INTERRUPT);
 	} else {
 		u32 lstatus_start = lstatus;
 
-- 
2.1.0.27.g96db324