From a264b981f2c76e281ef27e7232774bf6c54ec865 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= Date: Tue, 30 Jul 2013 11:29:40 +0200 Subject: [PATCH] net/fec: Don't let ndo_start_xmit return NETDEV_TX_BUSY without link MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: David S. Miller --- drivers/net/ethernet/freescale/fec_main.c | 5 ----- 1 file changed, 5 deletions(-) diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c index 0dda45481d16..77ea0db0bbfc 100644 --- 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; -- GitLab