linux-kernel - Re: kernfs: possible deadlock between of->mutex and mmap

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Date:	Mon, 3 Mar 2014 17:46:09 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	Greg KH <greg@...ah.com>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: kernfs: possible deadlock between of->mutex and mmap_sem

On Mon, Mar 03, 2014 at 05:44:52PM -0500, Sasha Levin wrote:
> >>I'll send a patch to fix it some time next week unless someone beats me to it :)
> >
> >How are you planning to fix it?  Prolly the right thing to do would be
> >caching atomic_write_len in open_file and copy data before grabbing
> >any locks.
> 
> I've actually didn't have a plan when I wrote that, was just
> planning on putting effort into it.

I'll prolly work on it tomorrow unless you beat me to it. :)

Thanks.

-- 
tejun
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