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

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Date:	Sun, 22 Dec 2013 21:22:24 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	Grygorii Strashko <grygorii.strashko@...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 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?

Thanks,
Sekhar
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