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authorLi Zefan <lizf@cn.fujitsu.com>2009-05-06 10:33:04 +0800
committerIngo Molnar <mingo@elte.hu>2009-05-06 10:38:19 +0200
commit2df75e415709ad12862028916c772c1f377f6a7c (patch)
tree3374a78cb06fe096e82d9e4d03ad03d048784967
parent96d17980fabeb757706d2d6db5a28580a6156bfc (diff)
tracing/events: fix memory leak when unloading module
When unloading a module, memory allocated by init_preds() and trace_define_field() is not freed. [ Impact: fix memory leak ] Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <4A00F6E0.3040503@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--include/linux/ftrace_event.h1
-rw-r--r--kernel/trace/trace_events.c18
-rw-r--r--kernel/trace/trace_events_filter.c22
3 files changed, 34 insertions, 7 deletions
diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index 5fff40c9ff5..662c1becf36 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -116,6 +116,7 @@ struct ftrace_event_call {
#define MAX_FILTER_STR_VAL 128
extern int init_preds(struct ftrace_event_call *call);
+extern void destroy_preds(struct ftrace_event_call *call);
extern int filter_match_preds(struct ftrace_event_call *call, void *rec);
extern int filter_current_check_discard(struct ftrace_event_call *call,
void *rec,
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index f789ca540fe..f251a150e75 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -60,6 +60,22 @@ err:
}
EXPORT_SYMBOL_GPL(trace_define_field);
+#ifdef CONFIG_MODULES
+
+static void trace_destroy_fields(struct ftrace_event_call *call)
+{
+ struct ftrace_event_field *field, *next;
+
+ list_for_each_entry_safe(field, next, &call->fields, link) {
+ list_del(&field->link);
+ kfree(field->type);
+ kfree(field->name);
+ kfree(field);
+ }
+}
+
+#endif /* CONFIG_MODULES */
+
static void ftrace_clear_events(void)
{
struct ftrace_event_call *call;
@@ -925,6 +941,8 @@ static void trace_module_remove_events(struct module *mod)
unregister_ftrace_event(call->event);
debugfs_remove_recursive(call->dir);
list_del(&call->list);
+ trace_destroy_fields(call);
+ destroy_preds(call);
}
}
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index f49486687ee..ce07b818671 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -346,6 +346,20 @@ static void filter_disable_preds(struct ftrace_event_call *call)
filter->preds[i]->fn = filter_pred_none;
}
+void destroy_preds(struct ftrace_event_call *call)
+{
+ struct event_filter *filter = call->filter;
+ int i;
+
+ for (i = 0; i < MAX_FILTER_PRED; i++) {
+ if (filter->preds[i])
+ filter_free_pred(filter->preds[i]);
+ }
+ kfree(filter->preds);
+ kfree(filter);
+ call->filter = NULL;
+}
+
int init_preds(struct ftrace_event_call *call)
{
struct event_filter *filter;
@@ -374,13 +388,7 @@ int init_preds(struct ftrace_event_call *call)
return 0;
oom:
- for (i = 0; i < MAX_FILTER_PRED; i++) {
- if (filter->preds[i])
- filter_free_pred(filter->preds[i]);
- }
- kfree(filter->preds);
- kfree(call->filter);
- call->filter = NULL;
+ destroy_preds(call);
return -ENOMEM;
}