linux-kernel - Re: [patch 34/75] arm: ep93xx: Kill another instance of broken irq

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Date:	Fri, 11 Feb 2011 13:22:30 +1300
From:	Ryan Mallon <ryan@...ewatersys.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Hartley Sweeten <hsweeten@...ionengravers.com>,
	Russell King <linux@....linux.org.uk>
Subject: Re: [patch 34/75] arm: ep93xx: Kill another instance of broken irq_desc
 fiddling

On 02/11/2011 12:37 PM, Thomas Gleixner wrote:
> 1. This is a copy of the borked code in gpiolib
> 2. If you need information about irq state which is not exposed, then talk
>    to the maintainer of that code instead of adding totaly horrible open
>    coded access.

This code got added simply because it is sometimes helpful to be able to
see how various gpio/irq pins are configured. I'm happy to drop the
functionality (see below), but is there a better way to get this
information? Is it already available somewhere else (proc, sys)?

> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Hartley Sweeten <hsweeten@...ionengravers.com>
> Cc: Russell King <linux@....linux.org.uk>
> ---
>  arch/arm/mach-ep93xx/gpio.c |   38 --------------------------------------
>  1 file changed, 38 deletions(-)
> 
> Index: linux-2.6-tip/arch/arm/mach-ep93xx/gpio.c
> ===================================================================
> --- linux-2.6-tip.orig/arch/arm/mach-ep93xx/gpio.c
> +++ linux-2.6-tip/arch/arm/mach-ep93xx/gpio.c
> @@ -354,44 +354,6 @@ static void ep93xx_gpio_dbg_show(struct 
>  				is_out ? "out" : "in ",
>  				(data_reg & (1 << i)) ? "hi" : "lo");
>  
> -		if (!is_out) {
> -			int irq = gpio_to_irq(gpio);
> -			struct irq_desc *desc = irq_desc + irq;
> -
> -			if (irq >= 0 && desc->action) {

Would be nice to at least keep the fact that the gpio is configured as
an interrupt. Something like:

	if (!is_out) {
		int irq;

		irq = gpio_to_irq(gpio);
		if (irq >= 0)
			seq_printf(s, " (irq %d)", irq);
	}

I'm okay with this patch as-is though. We can add a corrected patch
later if we decided that it is still useful to have this information.

~Ryan

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