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

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Message-ID: <46AEDC32.80709@sw.ru>
Date:	Tue, 31 Jul 2007 10:52:34 +0400
From:	"Denis V. Lunev" <den@...ru>
To:	Valerie Henson <val@....edu>
CC:	"Denis V. Lunev" <den@...nvz.org>, netdev@...r.kernel.org,
	davem@...emloft.net, tulip-users@...ts.sourceforge.net,
	devel@...nvz.org
Subject: Re: [PATCH] possible deadlock in tulip driver

Manual code check. The similar fixes are present in almost all drivers, 
f.e. tg3 one. I have an unrelated deadlock with rtnl.

Regards,
     Den

Valerie Henson wrote:
> (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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> 

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