netdev - Re: kernel panic in latest vanilla stable, while using nameif with "alive" pppoe interfaces

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Date:	Tue, 20 Oct 2009 09:02:35 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Michal Ostrowski <mostrows@...il.com>,
	Denys Fedoryschenko <denys@...p.net.lb>,
	netdev <netdev@...r.kernel.org>, linux-ppp@...r.kernel.org,
	paulus@...ba.org, mostrows@...thlink.net
Subject: Re: kernel panic in latest vanilla stable, while using nameif with 
	"alive" pppoe interfaces

On 10/20/09, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Michal Ostrowski a écrit :
>> Access of po->pppoe_dev is guarded by sk->sk_state & PPPOX_CONNECTED,
>> and all use cases now rely on the socket lock.  Because of this, the
>> ref-count on the namespace held by the socket object suffices to hold
>> the namespace in existence and so we don't need to ref-count the
>> namespace in PPPoE. The flush_lock is gone.
>>
>
> Seems good !
>
> But can we use lock_sock() in __pppoe_xmit() context ?
>

Eric, most probably i miss something, but how lock sock protect us
from mtu changed via sysfs. This action calls change mtu notifier
which doesn't care about sockets at all...
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