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

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Message-Id: <20080723.135530.63039342.davem@davemloft.net>
Date:	Wed, 23 Jul 2008 13:55:30 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jarkao2@...il.com
Cc:	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: Wed, 23 Jul 2008 22:43:35 +0200

> On Wed, Jul 23, 2008 at 01:16:07PM -0700, David Miller wrote:
> ...
> > There will always be a need for a "stop all the TX queues" operation.
> 
> The question is if the current way is "all correct". As a matter of
> fact I think Peter's doubts could be justified: taking "USHORT_MAX"
> locks looks really dubious (so maybe it's not so strange lockdep
> didn't get used to this).

There are, of course, potentially other ways to achieve the objective.

And for non-multiqueue aware devices (which is the vast majority of
the 400 or so networking drivers we have) there is only one queue and
thus one lock taken.
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