linux-kernel - Re: [PATCH 2/2] gpio/davinci: fix enabling unbanked GPIO IRQs

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Date:	Mon, 12 Mar 2012 11:53:51 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Sekhar Nori <nsekhar@...com>,
	Linus Walleij <linus.walleij@...ricsson.com>
Cc:	linux-kernel@...r.kernel.org,
	davinci-linux-open-source@...ux.davincidsp.com
Subject: Re: [PATCH 2/2] gpio/davinci: fix enabling unbanked GPIO IRQs

On Sun, 11 Mar 2012 18:16:12 +0530, Sekhar Nori <nsekhar@...com> wrote:
> Unbanked GPIO IRQ handling code made a copy of just
> the irq_chip structure for GPIO IRQ lines which caused
> problems after the generic IRQ chip conversion because
> there was no valid irq_chip_type structure with the
> right "regs" populated. irq_gc_mask_set_bit() was
> therefore accessing random addresses.
> 
> Fix it by making a copy of irq_chip_type structure
> instead. This will ensure sane register offsets.
> 
> Cc: <stable@...r.kernel.org> # v3.0.x+
> Reported-by: Jon Povey <Jon.Povey@...elogic.co.uk>
> Tested-by: Jon Povey <Jon.Povey@...elogic.co.uk>
> Signed-off-by: Sekhar Nori <nsekhar@...com>

Applied, thx.

g.

> ---
>  drivers/gpio/gpio-davinci.c |   11 ++++++-----
>  1 files changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c
> index a6777e5..3d00016 100644
> --- a/drivers/gpio/gpio-davinci.c
> +++ b/drivers/gpio/gpio-davinci.c
> @@ -386,7 +386,7 @@ static int __init davinci_gpio_irq_setup(void)
>  	 * IRQ mux conflicts; gpio_irq_type_unbanked() is only for GPIOs.
>  	 */
>  	if (soc_info->gpio_unbanked) {
> -		static struct irq_chip gpio_irqchip_unbanked;
> +		static struct irq_chip_type gpio_unbanked;
>  
>  		/* pass "bank 0" GPIO IRQs to AINTC */
>  		chips[0].chip.to_irq = gpio_to_irq_unbanked;
> @@ -394,9 +394,10 @@ static int __init davinci_gpio_irq_setup(void)
>  
>  		/* AINTC handles mask/unmask; GPIO handles triggering */
>  		irq = bank_irq;
> -		gpio_irqchip_unbanked = *irq_get_chip(irq);
> -		gpio_irqchip_unbanked.name = "GPIO-AINTC";
> -		gpio_irqchip_unbanked.irq_set_type = gpio_irq_type_unbanked;
> +		gpio_unbanked = *container_of(irq_get_chip(irq),
> +					      struct irq_chip_type, chip);
> +		gpio_unbanked.chip.name = "GPIO-AINTC";
> +		gpio_unbanked.chip.irq_set_type = gpio_irq_type_unbanked;
>  
>  		/* default trigger: both edges */
>  		g = gpio2regs(0);
> @@ -405,7 +406,7 @@ static int __init davinci_gpio_irq_setup(void)
>  
>  		/* set the direct IRQs up to use that irqchip */
>  		for (gpio = 0; gpio < soc_info->gpio_unbanked; gpio++, irq++) {
> -			irq_set_chip(irq, &gpio_irqchip_unbanked);
> +			irq_set_chip(irq, &gpio_unbanked.chip);
>  			irq_set_handler_data(irq, &chips[gpio / 32]);
>  			irq_set_status_flags(irq, IRQ_TYPE_EDGE_BOTH);
>  		}
> -- 
> 1.7.0.4
> 

-- 
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies,Ltd.
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