netdev - Re: [PATCH] inet_diag: make config INET

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Message-ID: <50611469.4000409@cn.fujitsu.com>
Date:	Tue, 25 Sep 2012 10:18:17 +0800
From:	Gao feng <gaofeng@...fujitsu.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Jan Engelhardt <jengelh@...i.de>,
	Stephen Hemminger <stephen.hemminger@...tta.com>,
	netdev@...r.kernel.org, davem@...emloft.net, kuznet@....inr.ac.ru
Subject: Re: [PATCH] inet_diag: make config INET_DIAG bool

于 2012年09月24日 19:32, Eric Dumazet 写道:
> On Mon, 2012-09-24 at 18:17 +0800, Gao feng wrote:
>> 于 2012年09月24日 17:42, Eric Dumazet 写道:
>>> In fact I didnt fully understand the problem you try to address.
>>>
>>> If you want to prevent module being unloaded, you need to add proper
>>> module_get()/module_put()
>>>
>>> So I would add a "struct module *module;" in struct sock_diag_handler
>>> and use it appropriately.
>>
>> Yes, I try to add reference of the module,but I can't find a proper
>> location to call module_get and module_put.
>>
>> module_get should be called when userspace program use netlink to
>> send dump request to the kernel,and module_put should be called when
>> the dump is completed. I am right?
>>
>> BUT the userspace program may only call netlink_sendmsg without call
>> netlink_recvmsg.so the reference of the module will be incorrect.
> 
> check ->dump() and ->done() methods
> 

I miss that cb->done will be called when netlink sock being destructed.
so add a reference of the inet_diag module is doable.

I will send a v2 patch.

Thanks!
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