linux-kernel - Re: [PATCH 1/4] module: implement module_inhibit

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Message-ID: <46F91B72.1080109@gmail.com>
Date:	Tue, 25 Sep 2007 23:30:10 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	Jonathan Corbet <corbet@....net>, ebiederm@...ssion.com,
	cornelia.huck@...ibm.com, greg@...ah.com, kay.sievers@...y.org,
	linux-kernel@...r.kernel.org, rusty@...tcorp.com.au
Subject: Re: [PATCH 1/4] module: implement module_inhibit_unload()

Alan Stern wrote:
>> The unloading can proceed once module_unload_inhibit_cnt reaches zero.
>> An unloading thread only has to care about inhibition put in effect
>> before unloading has started, so there's no need to check again.
> 
> You haven't fully answered Jon's question.  Suppose
> module_unload_inhibit_cnt is nonzero, so the task adds itself to the
> module_unload_wait queue, changes to TASK_UNINTERRUPTIBLE, and calls
> schedule.  There's nothing to prevent somebody else from waking the
> task back up before the original inhibition has been lifted.

Hmmm... I might be missing something here.  Who else can wake up a
thread in uninterruptible sleep?

Thanks.

-- 
tejun
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