tracing: Fix now invalid var_ref_vals assumption in trace action

[mirror_ubuntu-focal-kernel.git] / kernel / trace / trace_events.c

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index fba87d10f0c1af1ab9367a981667cc452efd4707..995061bb2deca03fd8757a86490b58735d81834e 100644 (file)
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -320,7 +320,8 @@ void trace_event_enable_cmd_record(bool enable)
        struct trace_event_file *file;
        struct trace_array *tr;
 
-       mutex_lock(&event_mutex);
+       lockdep_assert_held(&event_mutex);
+
        do_for_each_event_file(tr, file) {
 
                if (!(file->flags & EVENT_FILE_FL_ENABLED))
@@ -334,7 +335,6 @@ void trace_event_enable_cmd_record(bool enable)
                        clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags);
                }
        } while_for_each_event_file();
-       mutex_unlock(&event_mutex);
 }
 
 void trace_event_enable_tgid_record(bool enable)
@@ -342,7 +342,8 @@ void trace_event_enable_tgid_record(bool enable)
        struct trace_event_file *file;
        struct trace_array *tr;
 
-       mutex_lock(&event_mutex);
+       lockdep_assert_held(&event_mutex);
+
        do_for_each_event_file(tr, file) {
                if (!(file->flags & EVENT_FILE_FL_ENABLED))
                        continue;
@@ -356,7 +357,6 @@ void trace_event_enable_tgid_record(bool enable)
                                  &file->flags);
                }
        } while_for_each_event_file();
-       mutex_unlock(&event_mutex);
 }
 
 static int __ftrace_event_enable_disable(struct trace_event_file *file,