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gianfar: fix the last transmit buffer descriptor

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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: 48963b4492 ("gianfar: Remove redundant ops for do_tstamp
       from xmit()")
Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Reviewed-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yangbo Lu 2016-06-02 17:36:28 +08:00 committed by David S. Miller
parent 8d5958f424
commit 9c8b0778e4
1 changed files with 2 additions and 1 deletions
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3
drivers/net/ethernet/freescale/gianfar.c
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@ -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;