netdev - Re: [RFC(v2) net-next 01/13] ndisc: Refer/Update neigh->updated with write lock.

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Message-ID: <50F6B377.5000005@linux-ipv6.org>
Date:	Wed, 16 Jan 2013 23:04:39 +0900
From:	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
To:	Cong Wang <xiyou.wangcong@...il.com>
CC:	netdev@...r.kernel.org, YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Subject: Re: [RFC(v2) net-next 01/13] ndisc: Refer/Update neigh->updated with
 write lock.

Cong Wang wrote:
> On 01/16/2013 12:44 AM, YOSHIFUJI Hideaki wrote:
>> Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
>> ---
>>   net/ipv6/route.c |   12 ++++++++----
>>   1 file changed, 8 insertions(+), 4 deletions(-)
>>
>> diff --git a/net/ipv6/route.c b/net/ipv6/route.c
>> index 7c34c01..1341f68 100644
>> --- a/net/ipv6/route.c
>> +++ b/net/ipv6/route.c
>> @@ -499,22 +499,26 @@ static void rt6_probe(struct rt6_info *rt)
>>   	 * to no more than one per minute.
>>   	 */
>>   	neigh = rt ? rt->n : NULL;
>> -	if (!neigh || (neigh->nud_state & NUD_VALID))
>> +	if (!neigh)
>> +		return;
>> +	write_lock_bh(&neigh->lock);
>> +	if (neigh->nud_state & NUD_VALID) {
>> +		write_unlock_bh(&neigh->lock);
>>   		return;
>> -	read_lock_bh(&neigh->lock);
>> +	}
>>   	if (!(neigh->nud_state & NUD_VALID) &&
>>   	    time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
>>   		struct in6_addr mcaddr;
>>   		struct in6_addr *target;
>>   
>>   		neigh->updated = jiffies;
>> -		read_unlock_bh(&neigh->lock);
>> +		write_unlock_bh(&neigh->lock);
> 
> This looks like a bug fix, which deserves a separated patch rather than
> in this rt->n removal series.

Because the series depends on this, it is included here so far.

--yoshfuji
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