x86, mce: don't restart timer if disabled

Even it is in error path unlikely taken, add_timer_on() at
CPU_DOWN_FAILED* needs to be skipped if mce_timer is disabled.

Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Jan Beulich <jbeulich@novell.com>
Cc: <stable@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 721a77ca8115..4825a3d6eb40 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -1991,9 +1991,11 @@ mce_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
                 break;
         case CPU_DOWN_FAILED:
         case CPU_DOWN_FAILED_FROZEN:
-                t->expires = round_jiffies(jiffies +
+                if (!mce_ignore_ce && check_interval) {
+                        t->expires = round_jiffies(jiffies +
                                            __get_cpu_var(mce_next_interval));
-                add_timer_on(t, cpu);
+                        add_timer_on(t, cpu);
+                }
                 smp_call_function_single(cpu, mce_reenable_cpu, &action, 1);
                 break;
         case CPU_POST_DEAD: