netdev - Re: [PATCH 1/2] Issue NETDEV_CHANGE notification when bridge changes state

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Message-ID: <20110309150949.GE16951@cr0.redhat.com>
Date:	Wed, 9 Mar 2011 23:09:49 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Adam Majer <adamm@...bino.com>
Cc:	netdev@...r.kernel.org,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>,
	bridge@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] Issue NETDEV_CHANGE notification when bridge changes
 state

On Sat, Mar 05, 2011 at 11:18:33PM -0600, Adam Majer wrote:
>
>IPv6 address autoconfiguration relies on an UP interface to processes
>traffic normally. A bridge that is UP enters LEARNING state and this
>state "eats" any Router Advertising packets sent to the
>bridge. Issuing a NETDEV_CHANGE notification on the bridge interface
>when it changes state allows autoconfiguration code to retry
>querying router information.
>
...

>+static void br_port_change_notifier_handler(struct work_struct *work)
>+{
>+	struct net_bridge *br = container_of(work,
>+					     struct net_bridge,
>+					     change_notification_worker);
>+
>+	rtnl_lock();
>+	netdev_state_change(br->dev);
>+	rtnl_unlock();
>+}
>+

Do you really want user-space to get this notification too?
Why do you put it into a workqueue? Maybe it has to be called in
process-context?

Thanks.
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