linux-kernel - Re: [PATCH] [PATCH] extcon: driver model release call not needed

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Message-ID: <1350700237.3764.156.camel@anish-Inspiron-N5050>
Date:	Sat, 20 Oct 2012 11:30:37 +0900
From:	anish kumar <anish198519851985@...il.com>
To:	Chanwoo Choi <cw00.choi@...sung.com>
Cc:	gregkh@...uxfoundation.org, myungjoo.ham@...sung.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [PATCH] extcon: driver model release call not needed

On Sat, 2012-10-20 at 10:57 +0900, Chanwoo Choi wrote:
> On 10/19/2012 02:12 AM, anish kumar wrote:
> > From: anish kumar <anish198519851985@...il.com>
> > 
> > We don't need a release call in this file as we are doing
> > everything needed in unregister call and we don't have any
> > more pointer to free up.
> > 
> > Signed-off-by: anish kumar <anish198519851985@...il.com>
> > ---
> >  drivers/extcon/extcon-class.c |    4 +---
> >  1 files changed, 1 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c
> > index 946a318..cf30eb1 100644
> > --- a/drivers/extcon/extcon-class.c
> > +++ b/drivers/extcon/extcon-class.c
> > @@ -585,9 +585,7 @@ static void extcon_cleanup(struct extcon_dev *edev, bool skip)
> >  
> >  static void extcon_dev_release(struct device *dev)
> >  {
> > -	struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev);
> > -
> > -	extcon_cleanup(edev, true);
> > +	/* We don't have any thing to free here */
> >  }
> >  
> >  static const char *muex_name = "mutually_exclusive";
> 
> I can't agree this patch. The extcon_dev_release() function is used
> for dev->release. If some case without calling extcon_dev_unregister(),
> I think dev->release function is needed to free memory of edev->dev.
Is it not being released by extcon_dev_unregister?
I think it is released by that and we will do two times free and
list_del(&edev->entry) as it is called by extcon_dev_release also.
> 
> The edev->dev->release store the function pointer of extcon_dev_release()
> in extcon_dev_register().
> edev->dev->parent = dev;
> edev->dev->class = extcon_class;
> edev->dev->release = extcon_dev_release;
> 
> 
> Thanks,
> Chanwoo Choi


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