net/fec: Don't let ndo_start_xmit return NETDEV_TX_BUSY without link

Don't test for having link and let hardware deal with this situation.

Without this patch I see a machine running an -rt patched Linux being
stuck in sch_direct_xmit when it looses link while there is still a
packet to be sent. In this case the fec_enet_start_xmit routine returned
NETDEV_TX_BUSY which makes the network stack reschedule the packet and
so sch_direct_xmit calls fec_enet_start_xmit again.
I failed to reproduce a complete hang without -rt, but I think the
problem exists there, too.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 0dda45481d16b3525c75ff4f45b5222e87b3a075..77ea0db0bbfc3e326d8137a26623de8fba1c4945 100644 (file)
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -294,11 +294,6 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
        unsigned short  status;
        unsigned int index;
 
-       if (!fep->link) {
-               /* Link is down or auto-negotiation is in progress. */
-               return NETDEV_TX_BUSY;
-       }
-
        /* Fill in a Tx ring entry */
        bdp = fep->cur_tx;