linux-kernel - Re: [patch] revert: [NET]: Fix races in net_rx

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Date:	Tue, 17 Jul 2007 11:12:53 +0200
From:	Jarek Poplawski <jarkao2@...pl>
To:	Olaf Kirch <olaf.kirch@...cle.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, davem@...emloft.net
Subject: Re: [patch] revert: [NET]: Fix races in net_rx_action vs netpoll

On Tue, Jul 17, 2007 at 10:28:34AM +0200, Olaf Kirch wrote:
> On Tuesday 17 July 2007 09:55, Olaf Kirch wrote:
> > What I find more problematic about this portion of code though
> > is that once a net_device is over quota, net_rx_action will
> > loop for up to one jiffy, even if there's just this one device on
> > the poll_list.
> 
> Duh, wrong. For every loop, it'll add dev->weight to dev->quota,
> so it'll be fine very soon.

After your patch only two things can be different here: dev->poll_list
and this flag. Since Ingo offered testing it should be easy to check
after moving the check of "your" flag to __netif_rx_complete, and
skipping only list_del on true.

Jarek P.
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