linux-kernel - Re: [PATCH] netconsole: fix BUG during net device "upping"

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Message-ID: <20090323080455.GA4976@ff.dom.local>
Date:	Mon, 23 Mar 2009 08:04:55 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	mpm@...enic.com, marcin.slusarz@...il.com, netdev@...r.kernel.org,
	k-keiichi@...jp.nec.com, stable@...nel.org, rjw@...k.pl,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] netconsole: fix BUG during net device "upping"

On 23-03-2009 05:21, David Miller wrote:
> From: Matt Mackall <mpm@...enic.com>
> Date: Sun, 22 Mar 2009 20:20:58 -0500
> 
>> On Sun, 2009-03-22 at 12:02 +0100, Marcin Slusarz wrote:
>>> When ndo_open (eg skge_up) function printks something, netconsole decides
>>> it can use this device because it checks state only (netif_running) which is
>>> set before ndo_open. Check device flags too.
>> That's fairly unfortunate semantics for netif_running. But if Dave
>> agrees that it's reasonable for that to be set to true at this point in
>> time, then I guess we'll go with it.
> 
> These kind of printk's simply are not allowed, we've removed such
> printk's from other driver ->open() methods to fix this problem and
> that's what should be done here.

What is the rationale of this decision? printk is a basic tool,
especially designed to work in as many places as possible, and
netconsole is rather something secondary (sorry Matt)?!

Jarek P.
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