linux-kernel - Re: Possible IRQ lock inversion from 2.6.29-Linus-03321-gbe0ea69 (2.6.29-git)

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Date:	Fri, 27 Mar 2009 14:05:02 -0500
From:	Larry Finger <Larry.Finger@...inger.net>
To:	Jonathan Corbet <corbet@....net>
CC:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@....de>,
	Al Viro <viro@...iv.linux.org.uk>,
	Li Zefan <lizf@...fujitsu.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: Possible IRQ lock inversion from 2.6.29-Linus-03321-gbe0ea69
 (2.6.29-git)

Jonathan Corbet wrote:
> 
> We could do that.  When I made the change I'd verified that there were
> no users in IRQ context, and I couldn't really see why there should
> be.  I'd rather avoid adding all those IRQ disables if I can avoid it.
> 
> How about, instead, just reversing the order of lock acquisition in
> fasync_helper()?  That would increase the hold time for f_lock, but I
> have a hard time seeing that being a real problem.  I'm running with
> the following now; all seems well.  I'll send it up in a bit if nobody
> gripes.

The patch gets rid of the warning for me.

Larry
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