linux-kernel - [PATCH] Fix NULL pointer for Xen guests

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Date:	Tue, 27 Apr 2010 11:24:42 -0400
From:	Prarit Bhargava <prarit@...hat.com>
To:	linux-kernel@...r.kernel.org, suresh.b.siddha@...el.com,
	x86@...nel.org, clalance@...hat.com, drjones@...hat.com
Cc:	Prarit Bhargava <prarit@...hat.com>
Subject: [PATCH] Fix NULL pointer for Xen guests

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@...hat.com>
Acked-by: Suresh Siddha <suresh.b.siddha@...el.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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