1 files changed, 5 insertions, 0 deletions

diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index b8f56beb1a62..59de5141207c 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -17,6 +17,7 @@
 static struct trace_array       *ctx_trace;
 static int __read_mostly        tracer_enabled;
 static atomic_t                 sched_ref;
+static DEFINE_MUTEX(tracepoint_mutex);
 
 static void
 probe_sched_switch(struct rq *__rq, struct task_struct *prev,
@@ -125,18 +126,22 @@ static void tracing_start_sched_switch(void)
 {
         long ref;
 
+        mutex_lock(&tracepoint_mutex);
         ref = atomic_inc_return(&sched_ref);
         if (ref == 1)
                 tracing_sched_register();
+        mutex_unlock(&tracepoint_mutex);
 }
 
 static void tracing_stop_sched_switch(void)
 {
         long ref;
 
+        mutex_lock(&tracepoint_mutex);
         ref = atomic_dec_and_test(&sched_ref);
         if (ref)
                 tracing_sched_unregister();
+        mutex_unlock(&tracepoint_mutex);
 }
 
 void tracing_start_cmdline_record(void)