linux-kernel - Re: [PATCH 12/13] backlight: tosa_bl: use devm

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Message-ID: <CALT56yMro+2KPHPNdT4F+DdAjiK2e3QRUrx3CV8dVaoLhXa1Rw@mail.gmail.com>
Date:	Sat, 26 May 2012 10:43:07 +0400
From:	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
To:	Jingoo Han <jg1.han@...sung.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Richard Purdie <rpurdie@...ys.net>
Subject: Re: [PATCH 12/13] backlight: tosa_bl: use devm_ functions

On Fri, May 25, 2012 at 6:30 AM, Jingoo Han <jg1.han@...sung.com> wrote:
> The devm_ functions allocate memory that is released when a driver
> detaches. This patch uses devm_kzalloc of these functions.

Strictly speaking I see no point in this changes. There are no
'missing free' problems
in these drivers, the code path is clean enough. Is devm_kzalloc usage some kind
of policy, or it is just a future-proof change?

>
> Cc: Dmitry Baryshkov <dbaryshkov@...il.com>
> Cc: Richard Purdie <rpurdie@...ys.net>
> Signed-off-by: Jingoo Han <jg1.han@...sung.com>
> ---
>  drivers/video/backlight/tosa_bl.c |   11 +++++------
>  1 files changed, 5 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/video/backlight/tosa_bl.c b/drivers/video/backlight/tosa_bl.c
> index 2b241ab..0d54e60 100644
> --- a/drivers/video/backlight/tosa_bl.c
> +++ b/drivers/video/backlight/tosa_bl.c
> @@ -82,8 +82,11 @@ static int __devinit tosa_bl_probe(struct i2c_client *client,
>                const struct i2c_device_id *id)
>  {
>        struct backlight_properties props;
> -       struct tosa_bl_data *data = kzalloc(sizeof(struct tosa_bl_data), GFP_KERNEL);
> +       struct tosa_bl_data *data;
>        int ret = 0;
> +
> +       data = devm_kzalloc(&client->dev, sizeof(struct tosa_bl_data),
> +                               GFP_KERNEL);
>        if (!data)
>                return -ENOMEM;
>
> @@ -92,7 +95,7 @@ static int __devinit tosa_bl_probe(struct i2c_client *client,
>        ret = gpio_request(TOSA_GPIO_BL_C20MA, "backlight");
>        if (ret) {
>                dev_dbg(&data->bl->dev, "Unable to request gpio!\n");
> -               goto err_gpio_bl;
> +               return ret;
>        }
>        ret = gpio_direction_output(TOSA_GPIO_BL_C20MA, 0);
>        if (ret)
> @@ -122,8 +125,6 @@ err_reg:
>        data->bl = NULL;
>  err_gpio_dir:
>        gpio_free(TOSA_GPIO_BL_C20MA);
> -err_gpio_bl:
> -       kfree(data);
>        return ret;
>  }
>
> @@ -136,8 +137,6 @@ static int __devexit tosa_bl_remove(struct i2c_client *client)
>
>        gpio_free(TOSA_GPIO_BL_C20MA);
>
> -       kfree(data);
> -
>        return 0;
>  }
>
> --
> 1.7.1
>
>



-- 
With best wishes
Dmitry
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