netdev - Re: [PATCH 4/6] vlan: Optimize multiple unregistration

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Date:	Thu, 29 Oct 2009 14:45:44 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH 4/6] vlan: Optimize multiple unregistration

Eric Dumazet wrote:
> Patrick McHardy a écrit :
>>> +{
>>> +	LIST_HEAD(list);
>>> +	int i;
>>> +	struct net_device *vlandev;
>>> +	struct vlan_group save;
>>> +
>>> +	memcpy(&save, grp, sizeof(save));
>>> +	memset(&grp->vlan_devices_arrays, 0, sizeof(grp->vlan_devices_arrays));
>> This shouldn't be necessary since the lower device is already in the
>> process of being unregistered. If it was necessary, it could cause
>> crashes since the individual pointers are not set to zero atomically.
>> Or maybe I'm misunderstanding the purpose entirely :)
> 
> Very good point indeed, even if in practice memset() use long word transferts
> 
> I'll make a cleanup patch, or do you want to do it ?

I can take care of this, patch will follow shortly.

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