netdev - Re: [PATCH] possible deadlock in tulip driver

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Message-ID: <20070730191232.GC16182@rainbow>
Date:	Mon, 30 Jul 2007 13:12:32 -0600
From:	Valerie Henson <val@....edu>
To:	"Denis V. Lunev" <den@...nvz.org>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	tulip-users@...ts.sourceforge.net, devel@...nvz.org
Subject: Re: [PATCH] possible deadlock in tulip driver

(No longer maintainer, btw.)

What situation have you tested this under?  Thanks,

-VAL

On Tue, Jul 24, 2007 at 11:49:08AM +0400, Denis V. Lunev wrote:
> Calling flush_scheduled_work() may deadlock if called under rtnl_lock
> (from dev->stop) as linkwatch_event() may be on the workqueue and it will try
> to get the rtnl_lock
> 
> Signed-off-by: Denis V. Lunev <den@...nvz.org>
> ---
> 
>  tulip_core.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> --- ./drivers/net/tulip/tulip_core.c.tulip	2007-07-16 12:54:29.000000000 +0400
> +++ ./drivers/net/tulip/tulip_core.c	2007-07-23 19:06:24.000000000 +0400
> @@ -726,8 +726,6 @@ static void tulip_down (struct net_devic
>  	void __iomem *ioaddr = tp->base_addr;
>  	unsigned long flags;
>  
> -	flush_scheduled_work();
> -
>  	del_timer_sync (&tp->timer);
>  #ifdef CONFIG_TULIP_NAPI
>  	del_timer_sync (&tp->oom_timer);
> @@ -1788,6 +1786,8 @@ static void __devexit tulip_remove_one (
>  	if (!dev)
>  		return;
>  
> +	flush_scheduled_work();
> +
>  	tp = netdev_priv(dev);
>  	unregister_netdev(dev);
>  	pci_free_consistent (pdev,
> -
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