netdev - RE: [PATCH] net/fec: Don't let ndo_start_xmit return NETDEV_TX

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Message-ID: <9848F2DB572E5649BA045B288BE08FBE015DC3C7@039-SN2MPN1-023.039d.mgd.msft.net>
Date:	Tue, 30 Jul 2013 09:59:20 +0000
From:	Duan Fugang-B38611 <B38611@...escale.com>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:	"David S. Miller" <davem@...emloft.net>,
	Estevam Fabio-R49496 <r49496@...escale.com>,
	Li Frank-B20596 <B20596@...escale.com>,
	Shawn Guo <shawn.guo@...aro.org>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>,
	Hector Palacios <hector.palacios@...i.com>,
	Tim Sander <tim.sander@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Florian Fainelli <florian@...nwrt.org>,
	Ben Hutchings <bhutchings@...arflare.com>
Subject: RE: [PATCH] net/fec: Don't let ndo_start_xmit return NETDEV_TX_BUSY
 without link

On Tue, Jul 30, 2013 at 05:30 PM, Uwe Kleine-König <u.kleine-koenig@...gutronix.de> wrote:

>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-K?nig <u.kleine-koenig@...gutronix.de>

Acked-and-tested-by: Fugang Duan  <B38611@...escale.com>