x86: avoid early crash in disable_local_APIC()

E.g. when called due to an early panic.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/x86/kernel/apic.c b/arch/x86/kernel/apic.c
index 0f830e4f5675..d19aa3aab62b 100644
--- a/arch/x86/kernel/apic.c
+++ b/arch/x86/kernel/apic.c
@@ -895,6 +895,10 @@ void disable_local_APIC(void)
 {
         unsigned int value;
 
+        /* APIC hasn't been mapped yet */
+        if (!apic_phys)
+                return;
+
         clear_local_APIC();
 
         /*