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

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Date:	Tue, 3 Jan 2012 13:53:05 -0500
From:	Neil Horman <nhorman@...driver.com>
To:	David Miller <davem@...emloft.net>
Cc:	linux-kernel@...r.kernel.org, jbarnes@...tuousgeek.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 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.

Thanks
Neil

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