Fix NULL pointer for Xen guests
in [Kernel]
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From: H. Peter Anvin on 30 Apr 2010 17:40 On 04/30/2010 01:55 PM, H. Peter Anvin wrote: > This looks like it should be tagged stable for 2.6.33. Is that correct? > > -hpa Nevermind... see it has already been discussed. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Prarit Bhargava on 30 Apr 2010 18:10
On 04/30/2010 04:55 PM, H. Peter Anvin wrote: > This looks like it should be tagged stable for 2.6.33. Is that correct? > > Yes. P. > -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(a)redhat.com> >> Acked-by: Suresh Siddha<suresh.b.siddha(a)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 >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in >> the body of a message to majordomo(a)vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> Please read the FAQ at http://www.tux.org/lkml/ >> > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |