netdev - Re: [PATCH v4 for-next 03/12] IB/core: Find the network namespace matching connection parameters

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Date:	Wed, 20 May 2015 17:48:36 +0300
From:	Haggai Eran <haggaie@...lanox.com>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
CC:	Doug Ledford <dledford@...hat.com>, <linux-rdma@...r.kernel.org>,
	<netdev@...r.kernel.org>, Liran Liss <liranl@...lanox.com>,
	Guy Shapiro <guysh@...lanox.com>,
	Shachar Raindel <raindel@...lanox.com>,
	Yotam Kenneth <yotamke@...lanox.com>
Subject: Re: [PATCH v4 for-next 03/12] IB/core: Find the network namespace
 matching connection parameters

On 19/05/2015 21:26, Jason Gunthorpe wrote:
>> +	list_for_each_entry_rcu(client, &client_list, list)
>> +		if (client->get_net_device_by_port_pkey_ip) {
>> +			ret = client->get_net_device_by_port_pkey_ip(dev, port,
>> +								     pkey,
>> +
>> addr);
> 
> Considering the patch that introduced the rwsem, this doesn't look
> right.
> 
> We can't call a client call back on a device that is unregistered, we
> can't call a client call back on a client that is unregistering.
> 
> So the ordering of the list_del/add vs call back calls in device.c is
> not right, please audit everything with an eye toward maintaing sane
> invarients.

Thanks for pointing that out. I'll do that.

Haggai

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