From: Keir Fraser <keir@xen.org>
Date: Tue, 26 Apr 2011 13:11:18 +0000 (+0100)
Subject: x86: Bail from hpet_disable_legacy_broadcast() if legacy_hpet_event is uninitialised.
X-Git-Tag: 4.1.1-rc1~25
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=09de2b06e3d6e3c5e752f00c993efe3a7b6e104f;p=people%2Fvhanquez%2Fxen.git

x86: Bail from hpet_disable_legacy_broadcast() if legacy_hpet_event is uninitialised.

Signed-off-by: Keir Fraser <keir@xen.org>
---

diff --git a/xen/arch/x86/hpet.c b/xen/arch/x86/hpet.c
index 6fc7a3558..1107fb727 100644
--- a/xen/arch/x86/hpet.c
+++ b/xen/arch/x86/hpet.c
@@ -647,6 +647,9 @@ void hpet_disable_legacy_broadcast(void)
     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;