linux-kernel - Re: [PATCH 3/4] extcon: palmas: Fix NULL pointer error

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Message-ID: <CAGTfZH1hb30-9VF8pGmvetMs6_rzoKpL-fV7i_eOm9XNpmV9rQ@mail.gmail.com>
Date:	Mon, 22 Jun 2015 09:58:02 +0900
From:	Chanwoo Choi <cwchoi00@...il.com>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	"myungjoo.ham@...sung.com" <myungjoo.ham@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: [PATCH 3/4] extcon: palmas: Fix NULL pointer error

On Mon, Jun 22, 2015 at 9:45 AM, Krzysztof Kozlowski
<k.kozlowski@...sung.com> wrote:
> 2015-06-19 15:48 GMT+09:00 Chanwoo Choi <cwchoi00@...il.com>:
>> This patch fixes NULL pointer error by removing the unneeded kfree() call
>> of edev->name because extcon-palmas no longer allocate the memory for edev->name.
>
> So the kfree() was executed on pointer returned by "dev_name(edev->dev.parent)"?
>

Right.

>
>> Fixes: d71aadda19f8 ("extcon: Remove the optional name of extcon device")
>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
>> ---
>>  drivers/extcon/extcon-palmas.c | 7 -------
>>  1 file changed, 7 deletions(-)
>>
>> diff --git a/drivers/extcon/extcon-palmas.c b/drivers/extcon/extcon-palmas.c
>> index 080d5cc..4e7335f 100644
>> --- a/drivers/extcon/extcon-palmas.c
>> +++ b/drivers/extcon/extcon-palmas.c
>> @@ -200,7 +200,6 @@ static int palmas_usb_probe(struct platform_device *pdev)
>>         status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
>>         if (status) {
>>                 dev_err(&pdev->dev, "failed to register extcon device\n");
>> -               kfree(palmas_usb->edev->name);
>>                 return status;
>>         }
>>
>> @@ -214,7 +213,6 @@ static int palmas_usb_probe(struct platform_device *pdev)
>>                 if (status < 0) {
>>                         dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
>>                                         palmas_usb->id_irq, status);
>> -                       kfree(palmas_usb->edev->name);
>>                         return status;
>>                 }
>>         }
>> @@ -229,7 +227,6 @@ static int palmas_usb_probe(struct platform_device *pdev)
>>                 if (status < 0) {
>>                         dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
>>                                         palmas_usb->vbus_irq, status);
>> -                       kfree(palmas_usb->edev->name);
>>                         return status;
>>                 }
>>         }
>> @@ -241,10 +238,6 @@ static int palmas_usb_probe(struct platform_device *pdev)
>>
>>  static int palmas_usb_remove(struct platform_device *pdev)
>>  {
>> -       struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
>> -
>> -       kfree(palmas_usb->edev->name);
>> -
>>         return 0;
>>  }
>
> The remove function is now no-op so I think you can remove it. The
> platform driver code executes it only if it is non-NULL.

OK.

Thanks,
Chanwoo Choi
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