trace-graph: Allow update of task filters with same filter

Allow trace_graph_update_filters have the ginfo filters passed to
it. This will give a way to let external users to refresh the graph
filters.

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

1 files changed, 9 insertions, 4 deletions

diff --git a/trace-graph.c b/trace-graph.c
index 2bbe73f..73e69d3 100644
--- a/trace-graph.c
+++ b/trace-graph.c
@@ -552,11 +552,16 @@ void trace_graph_update_filters(struct graph_info *ginfo,
                                 struct filter_task *task_filter,
                                 struct filter_task *hide_tasks)
 {
-        filter_task_hash_free(ginfo->task_filter);
-        filter_task_hash_free(ginfo->hide_tasks);
+        /* Make sure the filter passed in is not the filter we use */
+        if (task_filter != ginfo->task_filter) {
+                filter_task_hash_free(ginfo->task_filter);
+                ginfo->task_filter = filter_task_hash_copy(task_filter);
+        }
 
-        ginfo->task_filter = filter_task_hash_copy(task_filter);
-        ginfo->hide_tasks = filter_task_hash_copy(hide_tasks);
+        if (hide_tasks != ginfo->hide_tasks) {
+                filter_task_hash_free(ginfo->hide_tasks);
+                ginfo->hide_tasks = filter_task_hash_copy(hide_tasks);
+        }
 
         if (ginfo->filter_enabled)
                 redraw_graph(ginfo);