linux-kernel - Re: [PATCH 1/1] atl1c: fix issue of transmit queue 0 timed out

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Message-ID: <1340742224.2644.1.camel@bwh-desktop.uk.solarflarecom.com>
Date:	Tue, 26 Jun 2012 21:23:44 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	"Ren, Cloud" <cjren@....qualcomm.com>
CC:	<davem@...emloft.net>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <qca-linux-team@...lcomm.com>,
	<nic-devel@...lcomm.com>, xiong <xiong@....qualcomm.com>
Subject: Re: [PATCH 1/1] atl1c: fix issue of transmit queue 0 timed out

On Tue, 2012-06-26 at 12:33 -0300, Ren, Cloud wrote:
> From: xiong <xiong@....qualcomm.com>
> 
> some people report atl1c could cause system hang with following
> kernel trace info:
> ---------------------------------------
> WARNING: at.../net/sched/sch_generic.c:258
> dev_watchdog+0x1db/0x1d0()
> ...
> NETDEV WATCHDOG: eth0 (atl1c): transmit queue 0 timed out
> ...
> ---------------------------------------
> This is caused by netif_stop_queue calling when cable Link is down
> but netif_wake_queue isn't called when cable Link is resume.
> 
> Signed-off-by: xiong <xiong@....qualcomm.com>
> Signed-off-by: Cloud Ren <cjren@....qualcomm.com>
> ---
>  drivers/net/ethernet/atheros/atl1c/atl1c_main.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
> index 85717cb..c2736c4 100644
> --- a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
> +++ b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
> @@ -351,6 +351,8 @@ static void atl1c_common_task(struct work_struct *work)
>  		atl1c_irq_disable(adapter);
>  		atl1c_check_link_status(adapter);
>  		atl1c_irq_enable(adapter);
> +		if (netif_queue_stopped(netdev) && netif_carrier_ok(netdev))
> +			netif_wake_queue(netdev);
>  	}
>  }
>  

Why explicitly stop/start the queue when the link changes?  That's what
link_watch is for.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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