linux-kernel - Re: [PATCH v2 1/2] gpio: davinci: don't create irq

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Date:	Mon, 23 Dec 2013 15:35:43 +0200
From:	Grygorii Strashko <grygorii.strashko@...com>
To:	Sekhar Nori <nsekhar@...com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>
CC:	Rob Herring <rob.herring@...xeda.com>,
	<prabhakar.csengg@...il.com>,
	<davinci-linux-open-source@...ux.davincidsp.com>,
	<linux-gpio@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] gpio: davinci: don't create irq_domain in case
 of unbanked irqs

On 12/22/2013 05:52 PM, Sekhar Nori wrote:
> On Wednesday 18 December 2013 03:37 PM, Grygorii Strashko wrote:
>> The system may crash if:
>> - there are more then 1 bank
>
> s/then/than
>
>> - unbanked irqs are enabled
>> - someone will call gpio_to_irq() for GPIO from bank2 or above
>>
>> Hence, fix it by not creating irq_domain if unbanked irqs are enabled
>> and correct gpio_to_irq_banked() to handle this properly.
>>
>> Cc: Linus Walleij <linus.walleij@...aro.org>
>> Cc: Alexandre Courbot <gnurou@...il.com>
>> Cc: Sekhar Nori <nsekhar@...com>
>>
>> Acked-by: Santosh Shilimkar <santosh.shilimkar@...com>
>> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
>> ---
>>   drivers/gpio/gpio-davinci.c |   34 +++++++++++++++++++---------------
>>   1 file changed, 19 insertions(+), 15 deletions(-)
>>
>> diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c
>> index 5d163c0..1b33806 100644
>> --- a/drivers/gpio/gpio-davinci.c
>> +++ b/drivers/gpio/gpio-davinci.c
>> @@ -351,7 +351,10 @@ static int gpio_to_irq_banked(struct gpio_chip *chip, unsigned offset)
>>   {
>>   	struct davinci_gpio_controller *d = chip2controller(chip);
>>
>> -	return irq_create_mapping(d->irq_domain, d->chip.base + offset);
>> +	if (d->irq_domain)
>> +		return irq_create_mapping(d->irq_domain, d->chip.base + offset);
>> +	else
>> +		return -ENXIO;
>>   }
>>
>>   static int gpio_to_irq_unbanked(struct gpio_chip *chip, unsigned offset)
>> @@ -429,7 +432,7 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev)
>>   	struct davinci_gpio_controller *chips = platform_get_drvdata(pdev);
>>   	struct davinci_gpio_platform_data *pdata = dev->platform_data;
>>   	struct davinci_gpio_regs __iomem *g;
>> -	struct irq_domain	*irq_domain;
>> +	struct irq_domain	*irq_domain = NULL;
>>
>>   	ngpio = pdata->ngpio;
>>   	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
>> @@ -453,18 +456,20 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev)
>>   	}
>>   	clk_prepare_enable(clk);
>>
>> -	irq = irq_alloc_descs(-1, 0, ngpio, 0);
>> -	if (irq < 0) {
>> -		dev_err(dev, "Couldn't allocate IRQ numbers\n");
>> -		return irq;
>> -	}
>> +	if (!pdata->gpio_unbanked) {
>> +		irq = irq_alloc_descs(-1, 0, ngpio, 0);
>> +		if (irq < 0) {
>> +			dev_err(dev, "Couldn't allocate IRQ numbers\n");
>> +			return -ENODEV;
>
> The code was correct before moving. Any objections to doing
>
> 			return irq;
>
> instead?

This is mistake. I'll update. Thanks

>
> Thanks,
> Sekhar
>

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