1 files changed, 4 insertions, 0 deletions

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 1752a63f37c0..f1ed080406c3 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2719,6 +2719,9 @@ void unregister_ftrace_graph(void)
 {
         mutex_lock(&ftrace_lock);
 
+        if (!unlikely(atomic_read(&ftrace_graph_active)))
+                goto out;
+
         atomic_dec(&ftrace_graph_active);
         unregister_trace_sched_switch(ftrace_graph_probe_sched_switch);
         ftrace_graph_return = (trace_func_graph_ret_t)ftrace_stub;
@@ -2726,6 +2729,7 @@ void unregister_ftrace_graph(void)
         ftrace_shutdown(FTRACE_STOP_FUNC_RET);
         unregister_pm_notifier(&ftrace_suspend_notifier);
 
+ out:
         mutex_unlock(&ftrace_lock);
 }