netdev - Re: Regression in net-2.6.24?

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Message-ID: <20071011182259.3715182d@freepuppy.rosehill>
Date:	Thu, 11 Oct 2007 18:22:59 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	David Miller <davem@...emloft.net>
Cc:	takano@...-inc.co.jp, netdev@...r.kernel.org,
	ilpo.jarvinen@...sinki.fi, mchan@...adcom.com
Subject: Re: Regression in net-2.6.24?

On Thu, 11 Oct 2007 18:14:49 -0700 (PDT)
David Miller <davem@...emloft.net> wrote:

> 
> Here is what I'm checking into net-2.6 for now:
> 
> commit 6f535763165331bb91277d7519b507fed22034e5
> Author: David S. Miller <davem@...set.davemloft.net>
> Date:   Thu Oct 11 18:08:29 2007 -0700
> 
>     [NET]: Fix NAPI completion handling in some drivers.
>     
>     In order for the list handling in net_rx_action() to be
>     correct, drivers must follow certain rules as stated by
>     this comment in net_rx_action():
>     
>     		/* Drivers must not modify the NAPI state if they
>     		 * consume the entire weight.  In such cases this code
>     		 * still "owns" the NAPI instance and therefore can
>     		 * move the instance around on the list at-will.
>     		 */
>     
>     A few drivers do not do this because they mix the budget checks
>     with reading hardware state, resulting in crashes like the one
>     reported by takano@...-inc.co.jp.
>     
>     BNX2 and TG3 are taken care of here, SKY2 fix is from Stephen
>     Hemminger.
>     
>     Signed-off-by: David S. Miller <davem@...emloft.net>
>

Please use the version I just sent, it saves another non-cached read.
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