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@nxp.com>
Reviewed-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
index 7615e0668acbf9b223b2087ed89646146dc6e827..2e6785b6e8bee1d971d739e160abe1ce17da9ca0 100644 (file)
--- 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;