Re: [PATCH 4/9] backlight: atmel-pwm-bl: clean up probe error handling

[Jean-Christophe PLAGNIOL-VILLARD]

On 11:55 Wed 23 Oct     , Johan Hovold wrote:
> Clean up probe error handling by checking parameters before any
> allocations and removing an obsolete error label. Also remove
> unnecessary reset of private gpio number.
> 
> Acked-by: Jingoo Han <jg1....@samsung.com>
> Signed-off-by: Johan Hovold <jhov...@gmail.com>
> ---
>  drivers/video/backlight/atmel-pwm-bl.c | 31 ++++++++++++-------------------
>  1 file changed, 12 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/video/backlight/atmel-pwm-bl.c 
> b/drivers/video/backlight/atmel-pwm-bl.c
> index cc5a5ed..52a8134 100644
> --- a/drivers/video/backlight/atmel-pwm-bl.c
> +++ b/drivers/video/backlight/atmel-pwm-bl.c
> @@ -126,40 +126,33 @@ static int atmel_pwm_bl_probe(struct platform_device 
> *pdev)
>       struct atmel_pwm_bl *pwmbl;
>       int retval;
>  
> +     pdata = dev_get_platdata(&pdev->dev);
> +     if (!pdata)
> +             return -ENODEV;
> +
> +     if (pdata->pwm_compare_max < pdata->pwm_duty_max ||
> +                     pdata->pwm_duty_min > pdata->pwm_duty_max ||
> +                     pdata->pwm_frequency == 0)
> +             return -EINVAL;
> +
>       pwmbl = devm_kzalloc(&pdev->dev, sizeof(struct atmel_pwm_bl),
>                               GFP_KERNEL);
>       if (!pwmbl)
>               return -ENOMEM;
>  
>       pwmbl->pdev = pdev;
> -
> -     pdata = dev_get_platdata(&pdev->dev);
> -     if (!pdata) {
> -             retval = -ENODEV;
> -             goto err_free_mem;
> -     }
> -
> -     if (pdata->pwm_compare_max < pdata->pwm_duty_max ||
> -                     pdata->pwm_duty_min > pdata->pwm_duty_max ||
> -                     pdata->pwm_frequency == 0) {
> -             retval = -EINVAL;
> -             goto err_free_mem;
> -     }
> -
>       pwmbl->pdata = pdata;
>       pwmbl->gpio_on = pdata->gpio_on;
>  
>       retval = pwm_channel_alloc(pdata->pwm_channel, &pwmbl->pwmc);
>       if (retval)
> -             goto err_free_mem;
> +             return retval;
>  
>       if (pwmbl->gpio_on != -1) {
gpio_is_valid here
>               retval = devm_gpio_request(&pdev->dev, pwmbl->gpio_on,
>                                       "gpio_atmel_pwm_bl");
> -             if (retval) {
> -                     pwmbl->gpio_on = -1;
> +             if (retval)
>                       goto err_free_pwm;
> -             }
>  
>               /* Turn display off by default. */
>               retval = gpio_direction_output(pwmbl->gpio_on,
> @@ -197,7 +190,7 @@ static int atmel_pwm_bl_probe(struct platform_device 
> *pdev)
>  
>  err_free_pwm:
>       pwm_channel_free(&pwmbl->pwmc);
> -err_free_mem:
> +
>       return retval;
>  }
>  
> -- 
> 1.8.4
> 
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