linux-kernel - Re: [2.6.33-rc5] tty: possible irq lock inversion dependency intty

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Message-Id: <201002071712.CBC51501.SFFtLOMOQVJHFO@I-love.SAKURA.ne.jp>
Date:	Sun, 7 Feb 2010 17:12:14 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	gregkh@...e.de, torvalds@...ux-foundation.org
Cc:	taviso@...gle.com, viro@...IV.linux.org.uk,
	linux-kernel@...r.kernel.org, ebiederm@...ssion.com,
	alan@...rguk.ukuu.org.uk, jdike@...toit.com, jln@...gle.com,
	mpm@...enic.com
Subject: Re: [2.6.33-rc5] tty: possible irq lock inversion dependency intty_fasync

Greg KH wrote:
> On Sat, Feb 06, 2010 at 10:46:01PM -0800, Linus Torvalds wrote:
> > 
> > 
> > On Sat, 6 Feb 2010, Linus Torvalds wrote:
> > > 
> > > Yeah. I think we need to just revert that commit.
> > > 
> > > Or maybe we could just do the following, rather than revert it outright: 
> > > just get a ref to the 'struct pid' while holding the spinlock, and then 
> > > releasing it after doing the __f_setown() call.
> > 
> > Btw, if we do this, then we should probably revert commit 
> > b04da8bfdfbbd79544cab2fadfdc12e87eb01600 at the same time.
> > 
> > Resulting patch would then look like the appended.
> 
> The patch looks correct to me, thanks for fixing this.
> 
>   Acked-by: Greg Kroah-Hartman <gregkh@...e.de>
> 
> Can you commit it to your tree, or do you need/want me to submit it?
> 
> thanks,
> 
> greg k-h
> 
That patch solved the lockdep warning.

Thank you.
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