x86: Fix NULL pointer access in irq_force_complete_move() for Xen guests
Upstream PV guests fail to boot because of a NULL pointer in irq_force_complete_move(). 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> LKML-Reference: <20100427152434.16193.49104.sendpatchset@prarit.bos.redhat.com> Acked-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com> Cc: <stable@kernel.org> [2.6.33]
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@ -2545,6 +2545,9 @@ void irq_force_complete_move(int irq)
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struct irq_desc *desc = irq_to_desc(irq);
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struct irq_cfg *cfg = desc->chip_data;
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if (!cfg)
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return;
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__irq_complete_move(&desc, cfg->vector);
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}
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#else
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