Subject: Re: [PATCH] bonding: avoid re-entry of bond_release

From: Ding Tianhong <[email-masked]>
Date: Sun, 21 Dec 2014 10:01:36 +0800

On 2014/12/19 23:11, Andy Gospodarek wrote:
> On Fri, Dec 19, 2014 at 04:56:57PM +0800, Wengang Wang wrote:
>> If bond_release is run against an interface which is already detached from
>> it's master, then there is an error message shown like
>> 	"<master name> cannot release <slave name>".
>>
>> The call path is:
>> 	bond_do_ioctl()
>> 		bond_release()
>> 			__bond_release_one()
>>
>> Though it does not really harm, the message the message is misleading.
>> This patch tries to avoid the message.
>>
>> Signed-off-by: Wengang Wang <[email-masked]>
>> ---
>>  drivers/net/bonding/bond_main.c | 5 ++++-
>>  1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
>> index 184c434..4a71bbd 100644
>> --- a/drivers/net/bonding/bond_main.c
>> +++ b/drivers/net/bonding/bond_main.c
>> @@ -3256,7 +3256,10 @@ static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd
>>  		break;
>>  	case BOND_RELEASE_OLD:
>>  	case SIOCBONDRELEASE:
>> -		res = bond_release(bond_dev, slave_dev);
>> +		if (slave_dev->flags & IFF_SLAVE)
>> +			res = bond_release(bond_dev, slave_dev);
>> +		else
>> +			res = 0;
> 
> Functionally this patch is fine, but I would prefer that you simply
> change the check in __bond_release_one to not be so noisy.  There is a
> check[1] in bond_enslave to see if a slave is already in a bond and that
> just prints a message of netdev_dbg (rather than netdev_err) and it
> seems that would be appropriate for this type of message.
> 
> [1] from bond_enslave():
> 
>         /* already enslaved */
>         if (slave_dev->flags & IFF_SLAVE) {
>                 netdev_dbg(bond_dev, "Error: Device was already enslaved\n");
>                 return -EBUSY;
>         }
> 
> 
>>  		break;
>>  	case BOND_SETHWADDR_OLD:
>>  	case SIOCBONDSETHWADDR:
>> -- 

agree ,use netdev_dbg looks more better and enough.

Ding

>> 1.8.3.1
>>
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