netdev - Re: tg3 reset

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Date:	Wed, 04 Apr 2007 13:53:47 -0700
From:	Gagan Arneja <gaagaan@...il.com>
To:	Michael Chan <mchan@...adcom.com>
CC:	netdev@...r.kernel.org
Subject: Re: tg3 reset_task question

I like the counting semaphore idea.

--
Gagan

Michael Chan wrote:
> On Wed, 2007-04-04 at 13:34 -0700, Gagan Arneja wrote:
>> Can't this BUG_ON be hit very easily:
>>
>> static void tg3_irq_quiesce(struct tg3 *tp)
>> {
>>         BUG_ON(tp->irq_sync);
>> ...
>> }
>>
>> tg3_reset_task could easily be racing with another thread, that calls
>> tg3_full_lock(tp, 1); e.g tg3_change_mtu. Maybe I'm missing something
>> obvious.
>>
> 
> Yes, you're right.  Perhaps we should get the rtnl first before
> tg3_full_lock(), or turn irq_sync into an atomic counter that allows
> nesting.
> 
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