linux-kernel - Re: [PATCH 2/4] gpio: davinci: Handle the return value of davinci_gpio_irq

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Date:   Thu, 20 Jul 2017 14:40:37 +0530
From:   Keerthy <j-keerthy@...com>
To:     Johan Hovold <johan@...nel.org>
CC:     <linus.walleij@...aro.org>, <ssantosh@...nel.org>,
        <devicetree@...r.kernel.org>, <nsekhar@...com>,
        <linux-kernel@...r.kernel.org>, <linux-gpio@...r.kernel.org>,
        <robh+dt@...nel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <fcooper@...com>
Subject: Re: [PATCH 2/4] gpio: davinci: Handle the return value of
 davinci_gpio_irq_setup function



On Thursday 20 July 2017 12:14 PM, Keerthy wrote:
> 
> 
> On Wednesday 19 July 2017 04:40 PM, Johan Hovold wrote:
>> On Tue, Jul 18, 2017 at 04:27:14PM +0530, Keerthy wrote:
>>> Currently davinci_gpio_irq_setup return value is ignored. Handle the
>>> return value appropriately.
>>>
>>> Signed-off-by: Keerthy <j-keerthy@...com>
>>> ---
>>>  drivers/gpio/gpio-davinci.c | 18 +++++++++++++-----
>>>  1 file changed, 13 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c
>>> index 2c88054..932f270 100644
>>> --- a/drivers/gpio/gpio-davinci.c
>>> +++ b/drivers/gpio/gpio-davinci.c
>>> @@ -233,15 +233,23 @@ static int davinci_gpio_probe(struct platform_device *pdev)
>>>  		chips->regs[bank] = gpio_base + offset_array[bank];
>>>  
>>>  	ret = devm_gpiochip_add_data(dev, &chips->chip, chips);
>>> +	if (ret)
>>> +		goto err;
>>> +
>>> +	platform_set_drvdata(pdev, chips);
>>> +	ret = davinci_gpio_irq_setup(pdev);
>>>  	if (ret) {
>>> -		ctrl_num = 0;
>>> -		bank_base = 0;
>>> -		return ret;
>>> +		platform_set_drvdata(pdev, NULL);
>>> +		goto err;
>>>  	}
>>>  
>>> -	platform_set_drvdata(pdev, chips);
>>> -	davinci_gpio_irq_setup(pdev);
>>>  	return 0;
>>
>> There's a separate but related bug here too as the clk_prepare_enable()
>> in davinci_gpio_irq_setup() is never balanced on driver unbind.
> 
> Yes Johan. I will send that as a separate patch.

This is already fixed in the latest kernel:

commit 6dc0048cff988858254fcc26becfc1e9753efa79
Author: Arvind Yadav <arvind.yadav.cs@...il.com>
Date:   Tue May 23 14:48:57 2017 +0530

Regards,
Keerthy
> 
>>
>> Johan
>>