linux-kernel - Re: [PATCH] extcon: adc-jack: Fix an error handling path in 'adc_jack

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Message-ID: <acc38674-b94d-b738-d737-49b6a4299d25@samsung.com>
Date:   Mon, 11 May 2020 10:47:10 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        myungjoo.ham@...sung.com, anish198519851985@...il.com,
        gregkh@...uxfoundation.org, jic23@...nel.org, lars@...afoo.de
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] extcon: adc-jack: Fix an error handling path in
 'adc_jack_probe()'

On 5/10/20 6:53 PM, Christophe JAILLET wrote:
> In some error handling paths, a call to 'iio_channel_get()' is not balanced
> by a corresponding call to 'iio_channel_release()'.
> 
> This can be achieved easily by using the devm_ variant of
> 'iio_channel_get()'.
> 
> This has the extra benefit to simplify the remove function.
> 
> Fixes: 19939860dcae ("extcon: adc_jack: adc-jack driver to support 3.5 pi or simliar devices")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> This patch in a more complete version than commit 5a696d9760fe
> ("extcon: adc-jack: Release IIO channel on driver remove") which fixed the
> issue for the remove function only.
> ---
>  drivers/extcon/extcon-adc-jack.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-adc-jack.c b/drivers/extcon/extcon-adc-jack.c
> index ad02dc6747a4..0317b614b680 100644
> --- a/drivers/extcon/extcon-adc-jack.c
> +++ b/drivers/extcon/extcon-adc-jack.c
> @@ -124,7 +124,7 @@ static int adc_jack_probe(struct platform_device *pdev)
>  	for (i = 0; data->adc_conditions[i].id != EXTCON_NONE; i++);
>  	data->num_conditions = i;
>  
> -	data->chan = iio_channel_get(&pdev->dev, pdata->consumer_channel);
> +	data->chan = devm_iio_channel_get(&pdev->dev, pdata->consumer_channel);
>  	if (IS_ERR(data->chan))
>  		return PTR_ERR(data->chan);
>  
> @@ -164,7 +164,6 @@ static int adc_jack_remove(struct platform_device *pdev)
>  
>  	free_irq(data->irq, data);
>  	cancel_work_sync(&data->handler.work);
> -	iio_channel_release(data->chan);
>  
>  	return 0;
>  }
> 

Applied it. Thanks.

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics