Re: [PATCH] Fix NULL pointer for Xen guests

["H. Peter Anvin" <hpa@zytor.com>]

This looks like it should be tagged stable for 2.6.33.  Is that correct?

	-hpa

On 04/27/2010 08:24 AM, Prarit Bhargava wrote:
> Upstream PV guests fail to boot because of a NULL pointer.  It is possible that
> xen guests have irq_desc->chip_data = NULL.
> 
> Test for NULL chip_data pointer before attempting to complete an irq move.
> 
> Signed-off-by: Prarit Bhargava <prarit@redhat.com>
> Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
> 
> diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
> index 127b871..eb2789c 100644
> --- a/arch/x86/kernel/apic/io_apic.c
> +++ b/arch/x86/kernel/apic/io_apic.c
> @@ -2545,6 +2545,9 @@ void irq_force_complete_move(int irq)
>  	struct irq_desc *desc = irq_to_desc(irq);
>  	struct irq_cfg *cfg = desc->chip_data;
>  
> +	if (!cfg)
> +		return;
> +
>  	__irq_complete_move(&desc, cfg->vector);
>  }
>  #else
> --
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