linux-kernel - Re: [PATCH] pinctrl: qcom: Release pin ranges when gpiochip_irqchip

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Message-ID: <53FED69B.3020406@smartplayin.com>
Date:	Thu, 28 Aug 2014 12:43:31 +0530
From:	Pramod Gurav <pramod.gurav@...rtplayin.com>
To:	Bjorn Andersson <bjorn@...o.se>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>,
	"Ivan T. Ivanov" <iivanov@...sol.com>,
	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH] pinctrl: qcom: Release pin ranges when gpiochip_irqchip_add
 fails

On Thursday 28 August 2014 02:54 AM, Bjorn Andersson wrote:
> On Wed, Aug 27, 2014 at 3:57 AM, Pramod Gurav
> <pramod.gurav@...rtplayin.com> wrote:
>> This patches adds a call to gpiochip_remove_pin_ranges when
>> gpiochip_irqchip_add fails to release memory allocated for pin_ranges.
>>
>> diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
>> @@ -845,6 +845,7 @@ static int msm_gpio_init(struct msm_pinctrl *pctrl)
>>                                    IRQ_TYPE_NONE);
>>         if (ret) {
>>                 dev_err(pctrl->dev, "Failed to add irqchip to gpiochip\n");
>> +               gpiochip_remove_pin_ranges(chip);
>>                 return -ENOSYS;
>>         }
> 
> Good catch, I guess this was lost in the introduction of gpiochip_irqchip...
> 
> 
> Rather than just releasing the pin_ranges of the gpio_chip you should
> probably add a gpiochip_remove() both here and in the case of
> gpiochip_add_pin_range() failing.

Thanks for review. But if I see implementation of gpiochip_remove() it does:
	gpiochip_irqchip_remove(chip);
        gpiochip_remove_pin_ranges(chip);
        of_gpiochip_remove(chip);

In above failure case only gpiochip_add() and gpiochip_add_pin_range()
have been successful hence I thought that would cause any problem to add
gpiochip_remove(). If that is not a problem I think we can call
gpiochip_remove() in fail case of gpiochip_add_pin_range() as well.
Do I make sense?

> 
> Regards,
> Bjorn
> --
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