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Date:   Tue, 03 Jan 2017 10:55:28 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     aconole@...hat.com
Cc:     kjlx@...pleofstupid.com, maheshb@...gle.com, netdev@...r.kernel.org
Subject: Re: [PATCH] Ipvlan should return an error when an address is
 already in use.

From: Aaron Conole <aconole@...hat.com>
Date: Tue, 03 Jan 2017 10:50:00 -0500

>> @@ -489,7 +490,12 @@ static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
>>  	   Notifier will trigger FIB update, so that
>>  	   listeners of netlink will know about new ifaddr */
>>  	rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
>> -	blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
>> +	ret = blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
> 
> Why are you doing this assignment if you aren't using the result?
> 
>> +	ret = notifier_to_errno(ret);
>> +	if (ret) {
>> +		__inet_del_ifa(in_dev, ifap, 1, NULL, portid);
>> +		return ret;
>> +	}

'ret' assignment is being used, via notifier_to_errno().

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