linux-kernel - Re: [PATCH] gpio: gpiolib: use devm

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Date:	Mon, 31 Aug 2015 14:16:54 +0900
From:	Alexandre Courbot <gnurou@...il.com>
To:	Grygorii Strashko <grygorii.strashko@...com>
Cc:	Peng Fan <van.freenix@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: gpiolib: use devm_* API to simplify driver code

On Tue, Aug 25, 2015 at 5:38 PM, Grygorii Strashko
<grygorii.strashko@...com> wrote:
> On 08/24/2015 03:05 PM, Peng Fan wrote:
>>
>> Use devm_* API to simplify driver code.
>>
>> Signed-off-by: Peng Fan <van.freenix@...il.com>
>> Cc: Linus Walleij <linus.walleij@...aro.org>
>> Cc: Alexandre Courbot <gnurou@...il.com>
>
>  ---
>>
>>   drivers/gpio/gpiolib.c | 11 +++++------
>>   1 file changed, 5 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
>> index 6bc612b..f9470b0 100644
>> --- a/drivers/gpio/gpiolib.c
>> +++ b/drivers/gpio/gpiolib.c
>> @@ -243,7 +243,8 @@ int gpiochip_add(struct gpio_chip *chip)
>>         int             base = chip->base;
>>         struct gpio_desc *descs;
>>
>> -       descs = kcalloc(chip->ngpio, sizeof(descs[0]), GFP_KERNEL);
>> +       descs = devm_kcalloc(chip->dev, chip->ngpio, sizeof(descs[0]),
>> +                            GFP_KERNEL);
>
>
> ^ above will not work for every one as NOT all GPIO drivers
> implemented using dev/drv model, so chip->dev could be not set
> (at least it was true when I've checked it last time).

AFAICT that is still true as of today.
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