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

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Date:	Wed, 23 Jul 2008 12:58:16 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	David Miller <davem@...emloft.net>, 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()

On Wed, 2008-07-23 at 10:13 +0000, Jarek Poplawski wrote:
> On Wed, Jul 23, 2008 at 11:50:14AM +0200, Peter Zijlstra wrote:
> ....
> > definite NAK on using raw spinlock ops...
> > 
> > I'll go look at this multiqueue stuff to see if there is anything to be
> > done.. David, what would be a good commit to start reading?
> 
> ....In the case David ever sleeps: I think, the current Linus' git is
> good enough (the problem is with netdevice.h: netif_tx_lock()).

Ah, right,...

that takes a whole bunch of locks at once..

Is that really needed? - when I grep for its usage its surprisingly few
drivers using it and even less generic code.

When I look at the mac802.11 code in ieee80211_tx_pending() it looks
like it can do with just one lock at a time, instead of all - but I
might be missing some obvious details.

So I guess my question is, is netif_tx_lock() here to stay, or is the
right fix to convert all those drivers to use __netif_tx_lock() which
locks only a single queue?

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