[Xen-changelog] [xen-unstable] x86/ucode: don't crash during AP bringup on non-Intel, non-AMD CPUs

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Jan Beulich <jbeulich@xxxxxxxx>
# Date 1345196168 -7200
# Node ID 64017d4df9daa7a243e4f8a63057cb94efb32626
# Parent  3468a834be8d7d36e135706639c4c61965ab8116
x86/ucode: don't crash during AP bringup on non-Intel, non-AMD CPUs

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Keir Fraser <keir@xxxxxxx>
---


diff -r 3468a834be8d -r 64017d4df9da xen/arch/x86/microcode.c
--- a/xen/arch/x86/microcode.c  Thu Aug 16 17:38:05 2012 +0100
+++ b/xen/arch/x86/microcode.c  Fri Aug 17 11:36:08 2012 +0200
@@ -109,6 +109,9 @@ int microcode_resume_cpu(int cpu)
     struct cpu_signature nsig;
     unsigned int cpu2;
 
+    if ( !microcode_ops )
+        return 0;
+
     spin_lock(&microcode_mutex);
 
     err = microcode_ops->collect_cpu_info(cpu, &uci->cpu_sig);

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