linux-kernel - Re: [PATCH] leds-lp3944: properly handle lp3944_configure fail in lp3944

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Date:	Mon, 17 May 2010 11:15:13 +0200
From:	Antonio Ospite <ospite@...denti.unina.it>
To:	Axel Lin <axel.lin@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Richard Purdie <rpurdie@...ux.intel.com>
Subject: Re: [PATCH] leds-lp3944: properly handle lp3944_configure fail in
 lp3944_probe

On Mon, 17 May 2010 09:34:02 +0800
Axel Lin <axel.lin@...il.com> wrote:

> In current implementation, lp3944_probe return 0 even if lp3944_configure fail.
> Therefore, led_classdev_unregister will be executed twice ( in error handling of lp3944_configure and lp3944_remove ).
> This patch properly handles lp3944_configure fail in lp3944_probe.
>

Hi Axel, thanks for the fix, I agree it's needed.
There are some minor comments inlined below.

Plus, when possible, I prefer commit messages to be wrapped to 72/80
characters per line. Please, consider this if you are sending a v2.

Ah, may I ask where you are using this driver? Just curious.

> Signed-off-by: Axel Lin <axel.lin@...il.com>
> ---
>  drivers/leds/leds-lp3944.c |   10 +++++++++-
>  1 files changed, 9 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/leds/leds-lp3944.c b/drivers/leds/leds-lp3944.c
> index 8d5ecce..03a24d0 100644
> --- a/drivers/leds/leds-lp3944.c
> +++ b/drivers/leds/leds-lp3944.c
> @@ -379,6 +379,7 @@ static int __devinit lp3944_probe(struct i2c_client *client,
>  {
>  	struct lp3944_platform_data *lp3944_pdata = client->dev.platform_data;
>  	struct lp3944_data *data;
> +	int err;
>  
>  	if (lp3944_pdata == NULL) {
>  		dev_err(&client->dev, "no platform data\n");
> @@ -403,8 +404,15 @@ static int __devinit lp3944_probe(struct i2c_client *client,
>  
>  	dev_info(&client->dev, "lp3944 enabled\n");
>  
> -	lp3944_configure(client, data, lp3944_pdata);
> +	err = lp3944_configure(client, data, lp3944_pdata);
> +	if (err < 0)
> +		goto err_configure;
> +

The dev_info(&client->dev, "lp3944 enabled\n"); could now go right
here, before the return 0, so we don't report the driver as enabled
even in the case its probe fails.

>  	return 0;
> +
> +err_configure:
> +	kfree(data);

add i2c_set_clientdata(client, NULL) here just like in lp3944_remove()

> +	return err;
>  }
>  
>  static int __devexit lp3944_remove(struct i2c_client *client)
> -- 
> 1.5.4.3
> 

Regards,
   Antonio

-- 
Antonio Ospite
http://ao2.it

PGP public key ID: 0x4553B001

A: Because it messes up the order in which people normally read text.
   See http://en.wikipedia.org/wiki/Posting_style
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?

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