linux-kernel - Re: [PATCH v2] PM: Fix dev_pm_put_subsys_data() to not call kfree() while holding device power lock

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Message-ID: <20130506194119.GA15886@kroah.com>
Date:	Mon, 6 May 2013 12:41:19 -0700
From:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To:	Shuah Khan <shuah.kh@...sung.com>
Cc:	"len.brown@...el.com" <len.brown@...el.com>,
	"rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"shuahkhan@...il.com" <shuahkhan@...il.com>
Subject: Re: [PATCH v2] PM: Fix dev_pm_put_subsys_data() to not call kfree()
 while holding device power lock

On Mon, May 06, 2013 at 07:04:53PM +0000, Shuah Khan wrote:
> dev_pm_put_subsys_data() calls kfree() while holding device power lock, when
> the reference count is 0. Fix it to call kfree() after releasing the lock.
> 
> Signed-off-by: Shuah Khan <shuah.kh@...sung.com>
> Reviewed-by: Pavel Machek <pavel@....cz>
> Reviewed-by: Rafael Wysocki <rafael.j.wysocki@...el.com>
> ---
>  drivers/base/power/common.c |    8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)

Is this causing a problem now, and it should go into 3.10 and earlier
kernels (if so, which ones?), or can it just wait until 3.11 as it's
just a cleanup fix?

thanks,

greg k-h
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