tracing: Clear all trace buffers when unloaded module event was used

Currently we do not know what buffer a module event was enabled in.
On unload, it is safest to clear all buffer instances, not just the
top level buffer.

Todo: Clear only the buffer that the event was used in. The
infrastructure is there to do this, but it makes the code a bit
more complex. Lets get the current code vetted before we add that.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 8 insertions, 2 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index b5b25b6575a9..c8a852a55db4 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -912,9 +912,15 @@ void tracing_reset_current(int cpu)
         tracing_reset(&global_trace, cpu);
 }
 
-void tracing_reset_current_online_cpus(void)
+void tracing_reset_all_online_cpus(void)
 {
-        tracing_reset_online_cpus(&global_trace);
+        struct trace_array *tr;
+
+        mutex_lock(&trace_types_lock);
+        list_for_each_entry(tr, &ftrace_trace_arrays, list) {
+                tracing_reset_online_cpus(tr);
+        }
+        mutex_unlock(&trace_types_lock);
 }
 
 #define SAVED_CMDLINES 128