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

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Message-ID: <4F27E96E.9010204@gmail.com>
Date:	Tue, 31 Jan 2012 07:15:26 -0600
From:	Rob Herring <robherring2@...il.com>
To:	Shawn Guo <shawn.guo@...aro.org>
CC:	Grant Likely <grant.likely@...retlab.ca>,
	linux-kernel@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Milton Miller <miltonm@....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()

Shawn,

On 01/31/2012 06:45 AM, Shawn Guo wrote:
> 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().

But this is the gpio controller code? Really this should be 4 domains,
but this temp fix is probably fine until you use my generic irq chip
support.

Rob

> 
> 	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.
> 
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