linux-kernel - Re: [PATCH v2] Input: soc_button_array: Remove kfree on data allocated with devm

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Date:	Fri, 25 Jul 2014 15:59:57 +0530
From:	Sachin Kamat <spk.linux@...il.com>
To:	pramod gurav <pramod.gurav.etc@...il.com>
Cc:	linux-input@...r.kernel.org,
	open list <linux-kernel@...r.kernel.org>,
	Pramod Gurav <pramod.gurav@...rtplayin.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Lejun Zhu <lejun.zhu@...ux.intel.com>,
	Sachin Kamat <sachin.kamat@...aro.org>
Subject: Re: [PATCH v2] Input: soc_button_array: Remove kfree on data
 allocated with devm_zalloc

Hi Pramod,


On Fri, Jul 25, 2014 at 2:42 PM,  <pramod.gurav.etc@...il.com> wrote:
> From: Pramod Gurav <pramod.gurav@...rtplayin.com>
>
> This patch does below:
> - Removes kfree done on data allocated with devm_zalloc in probe
>   path of the driver.
> - Adds a check on return value from devm_kzalloc which was missing
> - Removes the error lables and instead releases resources and returns
>   after failures
>
> CC: Dmitry Torokhov <dmitry.torokhov@...il.com>
> CC: Lejun Zhu <lejun.zhu@...ux.intel.com>
> CC: Sachin Kamat <sachin.kamat@...aro.org>
>
> Signed-off-by: Pramod Gurav <pramod.gurav@...rtplayin.com>
> ---
>
> Changes since v1:
> - Removes de_err logs on OOM cases which is not needed.
>
>  drivers/input/misc/soc_button_array.c |   27 +++++++++++++++------------
>  1 file changed, 15 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/input/misc/soc_button_array.c b/drivers/input/misc/soc_button_array.c
> index 5a6334b..f421cf4 100644
> --- a/drivers/input/misc/soc_button_array.c
> +++ b/drivers/input/misc/soc_button_array.c
> @@ -83,6 +83,11 @@ soc_button_device_create(struct pnp_dev *pdev,
>                                        sizeof(*gpio_keys_pdata) +
>                                         sizeof(*gpio_keys) * MAX_NBUTTONS,
>                                        GFP_KERNEL);
> +       if (!gpio_keys_pdata) {
> +               error = -ENOMEM;
> +               return ERR_PTR(error);

You don't need a variable here. You could directly do:
                   return ERR_PTR(-ENOMEM);

> +       }
> +
>         gpio_keys = (void *)(gpio_keys_pdata + 1);
>
>         for (info = button_info; info->name; info++) {
> @@ -104,7 +109,7 @@ soc_button_device_create(struct pnp_dev *pdev,
>
>         if (n_buttons == 0) {
>                 error = -ENODEV;
> -               goto err_free_mem;
> +               return ERR_PTR(error);

ditto

>         }
>
>         gpio_keys_pdata->buttons = gpio_keys;
> @@ -114,25 +119,23 @@ soc_button_device_create(struct pnp_dev *pdev,
>         pd = platform_device_alloc("gpio-keys", PLATFORM_DEVID_AUTO);
>         if (!pd) {
>                 error = -ENOMEM;
> -               goto err_free_mem;
> +               return ERR_PTR(error);

ditto

>         }
>
>         error = platform_device_add_data(pd, gpio_keys_pdata,
>                                          sizeof(*gpio_keys_pdata));
> -       if (error)
> -               goto err_free_pdev;

This goto could be retained to avoid code duplication.

> +       if (error) {
> +               platform_device_put(pd);
> +               return ERR_PTR(error);
> +       }
>
>         error = platform_device_add(pd);
> -       if (error)
> -               goto err_free_pdev;

ditto

> +       if (error) {
> +               platform_device_put(pd);
> +               return ERR_PTR(error);
> +       }
>
>         return pd;
> -
> -err_free_pdev:
> -       platform_device_put(pd);
> -err_free_mem:
> -       devm_kfree(&pdev->dev, gpio_keys_pdata);
> -       return ERR_PTR(error);
>  }
>
>  static void soc_button_remove(struct pnp_dev *pdev)
> --
> 1.7.9.5
>



-- 
Regards,
Sachin.
--
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