linux-kernel - RE: [PATCH 3/3] backlight: lm3533_bl: use devm

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Message-id: <000401cd37ac$6f4444a0$4dcccde0$%han@samsung.com>
Date:	Tue, 22 May 2012 08:50:00 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Johan Hovold' <jhovold@...il.com>
Cc:	'Andrew Morton' <akpm@...ux-foundation.org>,
	'LKML' <linux-kernel@...r.kernel.org>,
	'Richard Purdie' <rpurdie@...ys.net>,
	'Jingoo Han' <jg1.han@...sung.com>
Subject: RE: [PATCH 3/3] backlight: lm3533_bl: use devm_ functions

On Mon, May 21, 2012 at 06 6:59:00 PM +0900, Johan Hovol wrote:
>
> On Mon, May 21, 2012 at 06:20:01PM +0900, Jingoo Han wrote:
> > The devm_ functions allocate memory that is released when a driver
> > detaches. This patch uses devm_kzalloc of these functions.
> >
> > Cc: Johan Hovold <jhovold@...il.com>
> > Cc: Richard Purdie <rpurdie@...ys.net>
> > Signed-off-by: Jingoo Han <jg1.han@...sung.com>
> > ---
> >  drivers/video/backlight/lm3533_bl.c |    8 +++-----
> >  1 files changed, 3 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/video/backlight/lm3533_bl.c b/drivers/video/backlight/lm3533_bl.c
> > index 0148227..9f96a6b 100644
> > --- a/drivers/video/backlight/lm3533_bl.c
> > +++ b/drivers/video/backlight/lm3533_bl.c
> > @@ -295,7 +295,7 @@ static int __devinit lm3533_bl_probe(struct platform_device *pdev)
> >  		return -EINVAL;
> >  	}
> >
> > -	bl = kzalloc(sizeof(*bl), GFP_KERNEL);
> > +	bl = devm_kzalloc(&pdev->dev, sizeof(*bl), GFP_KERNEL);
> >  	if (!bl) {
> >  		dev_err(&pdev->dev,
> >  				"failed to allocate memory for backlight\n");
> > @@ -318,7 +318,7 @@ static int __devinit lm3533_bl_probe(struct platform_device *pdev)
> >  	if (IS_ERR(bd)) {
> >  		dev_err(&pdev->dev, "failed to register backlight device\n");
> >  		ret = PTR_ERR(bd);
> > -		goto err_free;
> > +		goto err_return;
> 
> Why not simply return PTR_ERR(bd) here?

Yes, you're right.
I will send the new patch.
Thanks.

Best regards,
Jingoo Han

> 
> >  	}
> >
> >  	bl->bd = bd;
> > @@ -348,8 +348,7 @@ err_sysfs_remove:
> >  	sysfs_remove_group(&bd->dev.kobj, &lm3533_bl_attribute_group);
> >  err_unregister:
> >  	backlight_device_unregister(bd);
> > -err_free:
> > -	kfree(bl);
> > +err_return:
> 
> No need for this label then.
> 
> >
> >  	return ret;
> >  }
> > @@ -367,7 +366,6 @@ static int __devexit lm3533_bl_remove(struct platform_device *pdev)
> >  	lm3533_ctrlbank_disable(&bl->cb);
> >  	sysfs_remove_group(&bd->dev.kobj, &lm3533_bl_attribute_group);
> >  	backlight_device_unregister(bd);
> > -	kfree(bl);
> >
> >  	return 0;
> >  }

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