[Xen-changelog] [xen-unstable] x86 hpet: Do nothing in hpet_broadcast_exit() if no timer deadline.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1259158378 0
# Node ID ce752efab1e11df69dd802a3c0865b40df81ffb1
# Parent  9ed5d7f23db5c186be3a37dd9f29441608db3bdd
x86 hpet: Do nothing in hpet_broadcast_exit() if no timer deadline.

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

diff -r 9ed5d7f23db5 -r ce752efab1e1 xen/arch/x86/hpet.c
--- a/xen/arch/x86/hpet.c       Wed Nov 25 14:11:37 2009 +0000
+++ b/xen/arch/x86/hpet.c       Wed Nov 25 14:12:58 2009 +0000
@@ -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);

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