linux-kernel - Re: [PATCH] msi: fix imbalanced refcount of msi irq sysfs objects

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Date:	Wed, 4 Jan 2012 14:51:34 -0500
From:	Neil Horman <nhorman@...driver.com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	David Miller <davem@...emloft.net>, linux-kernel@...r.kernel.org,
	bhelgaas@...gle.com, gregkh@...e.de, linux-pci@...r.kernel.org
Subject: Re: [PATCH] msi: fix imbalanced refcount of msi irq sysfs objects

On Wed, Jan 04, 2012 at 09:19:52AM -0800, Jesse Barnes wrote:
> On Tue, 3 Jan 2012 13:53:05 -0500
> Neil Horman <nhorman@...driver.com> wrote:
> 
> > On Tue, Jan 03, 2012 at 01:05:26PM -0500, David Miller wrote:
> > > From: Neil Horman <nhorman@...driver.com>
> > > Date: Tue,  3 Jan 2012 10:29:54 -0500
> > > 
> > > > This warning was recently reported to me:
> > > 
> > > I've hit this too, see:
> > > 
> > > http://marc.info/?l=linux-kernel&m=132458146927890&w=2
> > > 
> > > and my analysis at:
> > > 
> > > http://marc.info/?l=linux-arch&m=132458391128660&w=2
> > > 
> > Yup, your analysis is correct. Regardless of the why behind msi enablement
> > failing, we need to gate the kobject_del/put in free_msi_irqs on successful
> > completion of kobject_init_and_add in populate_msi_sysfs.  This patch does that,
> > using the parent pointer as a flag.
> 
> I applied this to my -next branch; doesn't seem critical to land
> immediately.  If you disagree let me know and I'll pull it over to my
> for-linus branch instead.
> 
> Thanks,
I'm ok with it waiting, but I'll defer to Dave and others who have seen it
occur.  It sounds like its alot of log noise.
Neil

> -- 
> Jesse Barnes, Intel Open Source Technology Center


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