[Xen-changelog] [xen-3.4-testing] x86 hpet: Do nothing in hpet_broadcast_exit() if no timer deadline.

["Xen patchbot-3.4-testing" <patchbot-3.4-testing@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1259310572 0
# Node ID 0fe0f26b4ee046e860f9521e88cb111f5c2e5d5c
# Parent  5325327eada0d590bf27e252f25ec6683f988c95
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-unstable changeset:   20497:ce752efab1e1
xen-unstable date:        Wed Nov 25 14:12:58 2009 +0000
---
 xen/arch/x86/hpet.c |    3 +++
 1 files changed, 3 insertions(+)

diff -r 5325327eada0 -r 0fe0f26b4ee0 xen/arch/x86/hpet.c
--- a/xen/arch/x86/hpet.c       Fri Nov 27 08:29:07 2009 +0000
+++ b/xen/arch/x86/hpet.c       Fri Nov 27 08:29:32 2009 +0000
@@ -655,6 +655,9 @@ 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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