linux-kernel - Re: [PATCH] genirq: spurious irq detection for threaded irqs

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Date:	Thu, 4 Mar 2010 23:26:20 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] genirq: spurious irq detection for threaded irqs

On Thu, 4 Mar 2010, Uwe Kleine-König wrote:
> -void note_interrupt(unsigned int irq, struct irq_desc *desc,
> -		    irqreturn_t action_ret)
> +void note_threaded_interrupt(unsigned int irq, struct irq_desc *desc,
> +		irqreturn_t action_ret)
>  {
>  	if (unlikely(action_ret != IRQ_HANDLED)) {
>  		/*
> @@ -262,6 +262,19 @@ void note_interrupt(unsigned int irq, struct irq_desc *desc,
>  	desc->irqs_unhandled = 0;
>  }
>  
> +void note_interrupt(unsigned int irq, struct irq_desc *desc,
> +		irqreturn_t action_ret)
> +{
> +	if (action_ret == IRQ_WAKE_THREAD)
> +		/* handled in irq_thread() when the threaded handler returns */
> +		return;
> +
> +	/* don't report IRQ_WAKE_THREAD | IRQ_HANDLED as bogus return value */
> +	action_ret &= ~IRQ_WAKE_THREAD;
> +
> +	note_threaded_interrupt(irq, desc, action_ret);
> +}
> +

We don't need an extra function for that. A simple

	if (action_ret & IRQ_WAKE_THREAD)
		return;

in note_interrupt() is sufficient to cover everything.

Thanks,

	tglx