linux-kernel - Re: [PATCH v3 1/4] genirq: Reserve the irq when calling irq_set

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Date:	Fri, 25 Mar 2011 23:30:04 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	David Daney <ddaney@...iumnetworks.com>
cc:	linux-mips@...ux-mips.org, ralf@...ux-mips.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/4] genirq: Reserve the irq when calling
 irq_set_chip()

On Fri, 25 Mar 2011, David Daney wrote:

> The helper macros and functions like for_each_active_irq() don't work
> unless the irq is in the allocated_irqs set.
> 
> In the case of !CONFIG_SPARSE_IRQ, instead of forcing all users of the
> irq infrastructure to explicitly call irq_reserve_irq(), do it for
> them.
> 
> Signed-off-by: David Daney <ddaney@...iumnetworks.com>
> ---
>  kernel/irq/chip.c |    6 ++++++
>  1 files changed, 6 insertions(+), 0 deletions(-)
> 
> diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
> index c9c0601..54d9aab 100644
> --- a/kernel/irq/chip.c
> +++ b/kernel/irq/chip.c
> @@ -37,6 +37,12 @@ int irq_set_chip(unsigned int irq, struct irq_chip *chip)
>  	irq_chip_set_defaults(chip);
>  	desc->irq_data.chip = chip;
>  	irq_put_desc_unlock(desc, flags);
> +	/*
> +	 * For !CONFIG_SPARSE_IRQ make the irq show up in
> +	 * allocated_irqs.  For the CONFIG_SPARSE_IRQ case, it may
> +	 * already be there, and this call is harmless.

For SPARSE=y it _IS_ already there, otherwise we would not reach that
code.

> +	 */
> +	irq_reserve_irq(irq);
>  	return 0;
>  }
>  EXPORT_SYMBOL(irq_set_chip);
> -- 
> 1.7.2.3
> 
> --
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