netdev - Re: [PATCH 2/3] Lost locking in fl6_sock

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Date:	Thu, 18 Oct 2007 16:11:58 +0400
From:	Pavel Emelyanov <xemul@...nvz.org>
To:	YOSHIFUJI Hideaki / 吉藤英明 
	<yoshfuji@...ux-ipv6.org>
CC:	davem@...emloft.net, netdev@...r.kernel.org, devel@...nvz.org
Subject: Re: [PATCH 2/3] Lost locking in fl6_sock_lookup

YOSHIFUJI Hideaki wrote:
> In article <47174950.6060409@...nvz.org> (at Thu, 18 Oct 2007 15:53:52 +0400), Pavel Emelyanov <xemul@...nvz.org> says:
> 
>> This routine scans the ipv6_fl_list whose update is
>> protected with the socket lock and the ip6_sk_fl_lock.
> 
>>  		struct ip6_flowlabel *fl = sfl->fl;
>>  		if (fl->label == label) {
>> +			read_unlock_bh(&ip6_sk_fl_lock);
>>  			fl->lastuse = jiffies;
>>  			atomic_inc(&fl->users);
>>  			return fl;
> 
> We should increment fl->users within the critical section, shouldn't we?

Not necessary. The users is more than zero (because it is 
linked in the sock's list) so garbage collector won't catch 
it in any way.

Thanks,
Pavel

> --yoshfuji
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