Re: [Xen-devel] [PATCH 04/11] Fix find_unbound_irq in presence ofioapic irqs.

[Konrad Rzeszutek Wilk]

On Mon, May 24, 2010 at 07:27:30PM +0100, Stefano Stabellini wrote:
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

Can you provide a more detailed description of why this is needed?

> ---
>  drivers/xen/events.c |   11 ++++++++++-
>  1 files changed, 10 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/xen/events.c b/drivers/xen/events.c
> index 8b68fc4..1356fa2 100644
> --- a/drivers/xen/events.c
> +++ b/drivers/xen/events.c
> @@ -339,9 +339,18 @@ static int find_unbound_irq(void)
>  	int irq;
>  	struct irq_desc *desc;
>  
> -	for (irq = 0; irq < nr_irqs; irq++)
> +	for (irq = 0; irq < nr_irqs; irq++) {
> +		desc = irq_to_desc(irq);
> +		/* only 0->15 have init'd desc; handle irq > 16 */
> +		if (desc == NULL)
> +			break;
> +		if (desc->chip == &no_irq_chip)
> +			break;
> +		if (desc->chip != &xen_dynamic_chip)
> +			continue;
>  		if (irq_info[irq].type == IRQT_UNBOUND)
>  			break;
> +	}
>  
>  	if (irq == nr_irqs)
>  		panic("No available IRQ to bind to: increase nr_irqs!\n");
> -- 
> 1.5.4.3
> 
> 
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