netdev - Re: [patch net-next 2/4] net: push code from net notifier reg/unreg into helpers

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Date:   Sat, 21 Dec 2019 09:07:46 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     David Ahern <dsahern@...il.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net,
        jakub.kicinski@...ronome.com, saeedm@...lanox.com, leon@...nel.org,
        tariqt@...lanox.com, ayal@...lanox.com, vladbu@...lanox.com,
        michaelgur@...lanox.com, moshe@...lanox.com, mlxsw@...lanox.com
Subject: Re: [patch net-next 2/4] net: push code from net notifier reg/unreg
 into helpers

Fri, Dec 20, 2019 at 07:07:59PM CET, dsahern@...il.com wrote:
>On 12/20/19 5:35 AM, Jiri Pirko wrote:
>> @@ -1784,6 +1784,42 @@ int unregister_netdevice_notifier(struct notifier_block *nb)
>>  }
>>  EXPORT_SYMBOL(unregister_netdevice_notifier);
>>  
>> +static int __register_netdevice_notifier_net(struct net *net,
>> +					     struct notifier_block *nb,
>> +					     bool ignore_call_fail)
>> +{
>> +	int err;
>> +
>> +	err = raw_notifier_chain_register(&net->netdev_chain, nb);
>> +	if (err)
>> +		return err;
>> +	if (dev_boot_phase)
>> +		return 0;
>> +
>> +	err = call_netdevice_register_net_notifiers(nb, net);
>> +	if (err && !ignore_call_fail)
>> +		goto chain_unregister;
>> +
>> +	return 0;
>> +
>> +chain_unregister:
>> +	raw_notifier_chain_unregister(&netdev_chain, nb);
>
>why is the error path using the global netdev_chain when the register is
>relative to a namespace? yes, I realize existing code does that and this

A bug. Will fix. Thanks!

>is maintaining that behavior.
>