1 files changed, 8 insertions, 2 deletions

diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index 9f001d904599..24582040b718 100644
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -95,7 +95,10 @@ static void nmi_cpu_save_registers(struct op_msrs *msrs)
 static void nmi_cpu_start(void *dummy)
 {
         struct op_msrs const *msrs = &__get_cpu_var(cpu_msrs);
-        model->start(msrs);
+        if (!msrs->controls)
+                WARN_ON_ONCE(1);
+        else
+                model->start(msrs);
 }
 
 static int nmi_start(void)
@@ -107,7 +110,10 @@ static int nmi_start(void)
 static void nmi_cpu_stop(void *dummy)
 {
         struct op_msrs const *msrs = &__get_cpu_var(cpu_msrs);
-        model->stop(msrs);
+        if (!msrs->controls)
+                WARN_ON_ONCE(1);
+        else
+                model->stop(msrs);
 }
 
 static void nmi_stop(void)