From 33fc368b24e4404ca4365d658f35b45603a12c4a Mon Sep 17 00:00:00 2001
From: Keir Fraser <keir.fraser@citrix.com>
Date: Wed, 25 Nov 2009 14:12:58 +0000
Subject: [PATCH] x86 hpet: Do nothing in hpet_broadcast_exit() if no timer
 deadline.

From: "Jiang, Yunhong" <yunhong.jiang@intel.com>
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
---
 xen/arch/x86/hpet.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/arch/x86/hpet.c b/xen/arch/x86/hpet.c
index c775aaa486..ec2a2b6afd 100644
--- a/xen/arch/x86/hpet.c
+++ b/xen/arch/x86/hpet.c
@@ -660,6 +660,9 @@ void hpet_broadcast_exit(void)
     int cpu = smp_processor_id();
     struct hpet_event_channel *ch = per_cpu(cpu_bc_channel, cpu);
 
+    if ( this_cpu(timer_deadline) == 0 )
+        return;
+
     BUG_ON( !ch );
 
     spin_lock_irq(&ch->lock);
-- 
2.30.2