netdev - Re: [PATCH net 5/6] rtnetlink: check DO_SETLINK_NOTIFY correctly in do

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Date:   Mon, 16 Oct 2017 14:20:27 +0200
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     David Ahern <dsahern@...il.com>, Xin Long <lucien.xin@...il.com>,
        network dev <netdev@...r.kernel.org>
Cc:     davem@...emloft.net, hannes@...essinduktion.org
Subject: Re: [PATCH net 5/6] rtnetlink: check DO_SETLINK_NOTIFY correctly in
 do_setlink

Le 16/10/2017 à 03:17, David Ahern a écrit :
> [ cc'ed Nicolas ]
> 
> On 10/15/17 4:13 AM, Xin Long wrote:
>> The check 'status & DO_SETLINK_NOTIFY' in do_setlink doesn't really
>> work after status & DO_SETLINK_MODIFIED, as:
>>
>>   DO_SETLINK_MODIFIED 0x1
>>   DO_SETLINK_NOTIFY 0x3
>>
>> Considering that notifications are suppposed to be sent only when
>> status have the flag DO_SETLINK_NOTIFY, the right check would be:
>>
>>   (status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY
>>
>> This would avoid lots of duplicated notifications when setting some
>> properties of a link.
>>
>> Fixes: ba9989069f4e ("rtnl/do_setlink(): notify when a netdev is modified")
>> Signed-off-by: Xin Long <lucien.xin@...il.com>
Good catch, thank you.

Acked-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>