linux-kernel - Re: [PATCH] staging:iio:adc:ad7816: Backward resources cleanups in probe

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Date:   Tue, 19 Jun 2018 07:59:26 +0200
From:   Lars-Peter Clausen <lars@...afoo.de>
To:     Karim Eshapa <karim.eshapa@...il.com>
Cc:     Michael.Hennerich@...log.com, jic23@...nel.org, knaack.h@....de,
        pmeerw@...erw.net, gregkh@...uxfoundation.org,
        linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging:iio:adc:ad7816: Backward resources cleanups in
 probe

On 06/19/2018 01:38 AM, Karim Eshapa wrote:
> Backward cleanups for all resources allocated in probing
> in case of failure at any regestering or allocation step.

Hi,

Thanks for the patch.

Resources that are allocated with devm_ are freed automatically in case of
an error, so this patch should not be necessary.

> 
> Signed-off-by: Karim Eshapa <karim.eshapa@...il.com>
> ---
>  drivers/staging/iio/adc/ad7816.c | 22 +++++++++++++++++-----
>  1 file changed, 17 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/staging/iio/adc/ad7816.c b/drivers/staging/iio/adc/ad7816.c
> index bf76a8620bdb..5ff14c830451 100644
> --- a/drivers/staging/iio/adc/ad7816.c
> +++ b/drivers/staging/iio/adc/ad7816.c
> @@ -373,7 +373,7 @@ static int ad7816_probe(struct spi_device *spi_dev)
>  	if (ret) {
>  		dev_err(&spi_dev->dev, "Fail to request rdwr gpio PIN %d.\n",
>  			chip->rdwr_pin);
> -		return ret;
> +		goto device_free;
>  	}
>  	gpio_direction_input(chip->rdwr_pin);
>  	ret = devm_gpio_request(&spi_dev->dev, chip->convert_pin,
> @@ -381,7 +381,7 @@ static int ad7816_probe(struct spi_device *spi_dev)
>  	if (ret) {
>  		dev_err(&spi_dev->dev, "Fail to request convert gpio PIN %d.\n",
>  			chip->convert_pin);
> -		return ret;
> +		goto free_rdwr_pin;
>  	}
>  	gpio_direction_input(chip->convert_pin);
>  	ret = devm_gpio_request(&spi_dev->dev, chip->busy_pin,
> @@ -389,7 +389,7 @@ static int ad7816_probe(struct spi_device *spi_dev)
>  	if (ret) {
>  		dev_err(&spi_dev->dev, "Fail to request busy gpio PIN %d.\n",
>  			chip->busy_pin);
> -		return ret;
> +		goto free_convert_pin;
>  	}
>  	gpio_direction_input(chip->busy_pin);
>  
> @@ -407,17 +407,29 @@ static int ad7816_probe(struct spi_device *spi_dev)
>  						indio_dev->name,
>  						indio_dev);
>  		if (ret)
> -			return ret;
> +			goto free_busy_pin;
>  	}
>  
>  	ret = devm_iio_device_register(&spi_dev->dev, indio_dev);
>  	if (ret)
> -		return ret;
> +		goto free_dev_irq;
>  
>  	dev_info(&spi_dev->dev, "%s temperature sensor and ADC registered.\n",
>  		 indio_dev->name);
>  
>  	return 0;
> +free_dev_irq:
> +	devm_free_irq(&spi_dev->dev, spi_dev->irq, indio_dev);
> +free_busy_pin:
> +	devm_gpio_free(&spi_dev->dev, chip->busy_pin);
> +free_convert_pin:
> +	devm_gpio_free(&spi_dev->dev, chip->convert_pin);
> +free_rdwr_pin:
> +	devm_gpio_free(&spi_dev->dev, chip->rdwr_pin);
> +device_free:
> +	devm_iio_device_free(&spi_dev->dev, indio_dev);
> +
> +	return ret;
>  }
>  
>  static const struct spi_device_id ad7816_id[] = {
>