[Xen-changelog] [xen-4.0-testing] x86: Bail from hpet_disable_legacy_broadcast() if legacy_hpet_event is uninitialised.

[Xen patchbot-4.0-testing <patchbot@xxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir@xxxxxxx>
# Date 1303823546 -3600
# Node ID 8b5cb0931ec253aea589c74e7a71b17f9cd3868a
# Parent  e102c30f19c80e085890e471e68795ceb5ec15cf
x86: Bail from hpet_disable_legacy_broadcast() if legacy_hpet_event is 
uninitialised.

Signed-off-by: Keir Fraser <keir@xxxxxxx>
xen-4.1-testing changeset:   23034:7c7ef1b6f4e5
xen-4.1-testing date:        Tue Apr 26 14:11:18 2011 +0100
---


diff -r e102c30f19c8 -r 8b5cb0931ec2 xen/arch/x86/hpet.c
--- a/xen/arch/x86/hpet.c       Mon Apr 25 13:45:06 2011 +0100
+++ b/xen/arch/x86/hpet.c       Tue Apr 26 14:12:26 2011 +0100
@@ -624,6 +624,9 @@
     u32 cfg;
     unsigned long flags;
 
+    if ( !legacy_hpet_event.shift )
+        return;
+
     spin_lock_irqsave(&legacy_hpet_event.lock, flags);
 
     legacy_hpet_event.flags |= HPET_EVT_DISABLE;

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