linux-kernel - Re: [PATCH v3 14/25] irq_domain: Remove irq_domain_add

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Date:	Tue, 31 Jan 2012 20:45:03 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	linux-kernel@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Milton Miller <miltonm@....com>,
	Rob Herring <rob.herring@...xeda.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	devicetree-discuss@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v3 14/25] irq_domain: Remove irq_domain_add_simple()

On Fri, Jan 27, 2012 at 02:36:08PM -0700, Grant Likely wrote:
> irq_domain_add_simple() was a stop-gap measure until complete irq_domain
> support was complete.  This patch removes the irq_domain_add_simple()
> interface.
> 
> v2: Updated to pass in host_data pointer on irq_domain allocation.
> 
> Signed-off-by: Grant Likely <grant.likely@...retlab.ca>
> Cc: Rob Herring <rob.herring@...xeda.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Milton Miller <miltonm@....com>
> ---
>  arch/arm/mach-imx/mach-imx6q.c      |    3 ++-
>  arch/arm/mach-msm/board-msm8x60.c   |    8 ++------
>  arch/arm/mach-mx5/imx51-dt.c        |    4 ++--
>  arch/arm/mach-mx5/imx53-dt.c        |    4 ++--
>  arch/arm/mach-omap2/board-generic.c |    2 +-
>  arch/arm/mach-prima2/irq.c          |    2 +-
>  drivers/mfd/twl-core.c              |    2 +-
>  include/linux/irqdomain.h           |    1 -
>  kernel/irq/irqdomain.c              |   10 ++--------
>  9 files changed, 13 insertions(+), 23 deletions(-)
> 
...
> --- a/arch/arm/mach-mx5/imx51-dt.c
> +++ b/arch/arm/mach-mx5/imx51-dt.c
> @@ -47,7 +47,7 @@ static const struct of_dev_auxdata imx51_auxdata_lookup[] __initconst = {
>  static int __init imx51_tzic_add_irq_domain(struct device_node *np,
>  				struct device_node *interrupt_parent)
>  {
> -	irq_domain_add_simple(np, 0);
> +	irq_domain_add_legacy(np, 32, 0, 0, &irq_domain_simple_ops, NULL);
>  	return 0;
>  }
>  
> @@ -57,7 +57,7 @@ static int __init imx51_gpio_add_irq_domain(struct device_node *np,
>  	static int gpio_irq_base = MXC_GPIO_IRQ_START + ARCH_NR_GPIOS;
>  
>  	gpio_irq_base -= 32;
> -	irq_domain_add_simple(np, gpio_irq_base);
> +	irq_domain_add_legacy(np, 32, gpio_irq_base, 0, &irq_domain_simple_ops, NULL);

The tzic on imx5 gets 128 irq lines rather than 32 here.  The current
code will make any hwirq that is > 32 hit the WARN_ON below in
irq_domain_legacy_revmap().

	WARN_ON(hwirq < first_hwirq || hwirq >= first_hwirq + size)

The first_hwirq is 0 and size is 32 in this case.

Changing 32 to 128 seems fixing the problem.

>  
>  	return 0;
>  }
> diff --git a/arch/arm/mach-mx5/imx53-dt.c b/arch/arm/mach-mx5/imx53-dt.c
> index 05ebb3e..89de5d4 100644
> --- a/arch/arm/mach-mx5/imx53-dt.c
> +++ b/arch/arm/mach-mx5/imx53-dt.c
> @@ -51,7 +51,7 @@ static const struct of_dev_auxdata imx53_auxdata_lookup[] __initconst = {
>  static int __init imx53_tzic_add_irq_domain(struct device_node *np,
>  				struct device_node *interrupt_parent)
>  {
> -	irq_domain_add_simple(np, 0);
> +	irq_domain_add_legacy(np, 32, 0, 0, &irq_domain_simple_ops, NULL);

Ditto

Regards,
Shawn

>  	return 0;
>  }
>  
> @@ -61,7 +61,7 @@ static int __init imx53_gpio_add_irq_domain(struct device_node *np,
>  	static int gpio_irq_base = MXC_GPIO_IRQ_START + ARCH_NR_GPIOS;
>  
>  	gpio_irq_base -= 32;
> -	irq_domain_add_simple(np, gpio_irq_base);
> +	irq_domain_add_legacy(np, 32, gpio_irq_base, 0, &irq_domain_simple_ops, NULL);
>  
>  	return 0;
>  }
--
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