netdev - Re: [PATCH net-next 8/8] 8021q: Check return of dev_set

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Message-ID: <485B801A.6090703@cn.fujitsu.com>
Date:	Fri, 20 Jun 2008 18:02:02 +0800
From:	Wang Chen <wangchen@...fujitsu.com>
To:	Patrick McHardy <kaber@...sh.net>
CC:	"David S. Miller" <davem@...emloft.net>,
	NETDEV <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 8/8] 8021q: Check return of dev_set_promiscuity/allmulti

Patrick McHardy said the following on 2008-6-20 17:47:
> Wang Chen wrote:
>> diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
>> index 5d055c2..1f2669b 100644
>> --- a/net/8021q/vlan_dev.c
>> +++ b/net/8021q/vlan_dev.c
>> @@ -547,12 +547,23 @@ static int vlan_dev_open(struct net_device *dev)
>>      }
>>      memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
>>  
>> -    if (dev->flags & IFF_ALLMULTI)
>> -        dev_set_allmulti(real_dev, 1);
>> -    if (dev->flags & IFF_PROMISC)
>> -        dev_set_promiscuity(real_dev, 1);
>> +    if (dev->flags & IFF_ALLMULTI) {
>> +        err = dev_set_allmulti(real_dev, 1);
>> +        if (err < 0)
>> +            goto out;
>> +    }
>> +    if (dev->flags & IFF_PROMISC) {
>> +        err = dev_set_promiscuity(real_dev, 1);
>> +        if (err < 0)
>> +            goto out;
>> +    }
>>  
>>      return 0;
>> +
>> +out:
>> +    if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
>> +        dev_unicast_delete(real_dev, dev->dev_addr, dev->addr_len);
>> +    return err;
> 
> This doesn't undo the operations that already succeeded.
> 

Why?
Should I do
 	dev_mc_unsync(real_dev, dev);
	dev_unicast_unsync(real_dev, dev);
before dev_unicast_delete()?

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