netdev - Re: Kernel WARNING: at net/core/dev.c:1330 __netif

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Message-Id: <20080801.000146.246099981.davem@davemloft.net>
Date:	Fri, 01 Aug 2008 00:01:46 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jarkao2@...il.com
Cc:	johannes@...solutions.net, netdev@...eo.de, peterz@...radead.org,
	Larry.Finger@...inger.net, kaber@...sh.net,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-wireless@...r.kernel.org, mingo@...hat.com
Subject: Re: Kernel WARNING: at net/core/dev.c:1330
 __netif_schedule+0x2c/0x98()

From: Jarek Poplawski <jarkao2@...il.com>
Date: Fri, 1 Aug 2008 07:01:50 +0000

> On Fri, Aug 01, 2008 at 06:48:10AM +0000, Jarek Poplawski wrote:
> > On Thu, Jul 31, 2008 at 05:29:32AM -0700, David Miller wrote:
> ...
> > > diff --git a/net/core/dev.c b/net/core/dev.c
> > > index 63d6bcd..69320a5 100644
> > > --- a/net/core/dev.c
> > > +++ b/net/core/dev.c
> > > @@ -4200,6 +4200,7 @@ static void netdev_init_queues(struct net_device *dev)
> > >  {
> > >  	netdev_init_one_queue(dev, &dev->rx_queue, NULL);
> > >  	netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
> > > +	spin_lock_init(&dev->tx_global_lock);
> > 
> > This will probably need some lockdep annotations similar to
> > _xmit_lock.
> 
> ...BTW, we probably could also consider some optimization here: the
> xmit_lock of the first queue could be treated as special, and only
> the owner could do such a freezing. This would save changes of
> functionality to non mq devices. On the other hand, it would need
> remembering about this special treatment (so, eg. a separate lockdep
> initialization than all the others).

I think special casing the zero's queue's lock is a bad idea.
Having a real top-level synchronizer is a powerful tool and
we could use it for other things.
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