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

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Date:	Fri, 25 Jul 2014 14:18:55 +0530
From:	pramod gurav <pramod.gurav.etc@...il.com>
To:	Sachin Kamat <spk.linux@...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] Input: soc_button_array: Remove kfree on data allocated
 with devm_zalloc

Thanks Sachin for the review. Will resend the patch addressing your
review comments.

On Fri, Jul 25, 2014 at 1:59 PM, Sachin Kamat <spk.linux@...il.com> wrote:
> On Fri, Jul 25, 2014 at 12:39 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
>>   and renames a lable from err_free_mem to err_mem.
>> - Adds couple of dev_err on failure to allocate memory
>>
>> 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>
>> ---
>>  drivers/input/misc/soc_button_array.c |   19 ++++++++++++++-----
>>  1 file changed, 14 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/input/misc/soc_button_array.c b/drivers/input/misc/soc_button_array.c
>> index 5a6334b..ac82971 100644
>> --- a/drivers/input/misc/soc_button_array.c
>> +++ b/drivers/input/misc/soc_button_array.c
>> @@ -83,6 +83,13 @@ soc_button_device_create(struct pnp_dev *pdev,
>>                                        sizeof(*gpio_keys_pdata) +
>>                                         sizeof(*gpio_keys) * MAX_NBUTTONS,
>>                                        GFP_KERNEL);
>> +       if (!gpio_keys_pdata) {
>> +               dev_err(&pdev->dev,
>> +                       "Can't allocate memory for gpio_keys_platform_data\n");
>
> OOM message is not needed as memory subsystem will take care of it.
>
>> +               error = -ENOMEM;
>> +               goto err_mem;
>
> Return directly from here.
>
>> +       }
>> +
>>         gpio_keys = (void *)(gpio_keys_pdata + 1);
>>
>>         for (info = button_info; info->name; info++) {
>> @@ -104,7 +111,7 @@ soc_button_device_create(struct pnp_dev *pdev,
>>
>>         if (n_buttons == 0) {
>>                 error = -ENODEV;
>> -               goto err_free_mem;
>> +               goto err_mem;
>
> ditto
>
>>         }
>>
>>         gpio_keys_pdata->buttons = gpio_keys;
>> @@ -114,7 +121,7 @@ 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;
>> +               goto err_mem;
>
> ditto
>
>>         }
>>
>>         error = platform_device_add_data(pd, gpio_keys_pdata,
>> @@ -130,8 +137,7 @@ soc_button_device_create(struct pnp_dev *pdev,
>>
>>  err_free_pdev:
>>         platform_device_put(pd);
>> -err_free_mem:
>> -       devm_kfree(&pdev->dev, gpio_keys_pdata);
>> +err_mem:
>
> This label would not be required once returned directly from above.
>
>>         return ERR_PTR(error);
>>  }
>>
>> @@ -155,8 +161,11 @@ static int soc_button_pnp_probe(struct pnp_dev *pdev,
>>         int error;
>>
>>         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
>> -       if (!priv)
>> +       if (!priv) {
>> +               dev_err(&pdev->dev,
>> +                       "Can't allocate memory for soc_button_data\n");
>
> OOM message is not needed as memory subsystem will take care of it.
>
>
> --
> Regards,
> Sachin.



-- 
Thanks and Regards
Pramod
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