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mm: remove useless rcu lock-unlock from mapping_tagged()
[cascardo/linux.git]
/
kernel
/
trace
/
trace_events_filter.c
diff --git
a/kernel/trace/trace_events_filter.c
b/kernel/trace/trace_events_filter.c
index
8008ddc
..
256764e
100644
(file)
--- a/
kernel/trace/trace_events_filter.c
+++ b/
kernel/trace/trace_events_filter.c
@@
-1886,6
+1886,12
@@
int apply_subsystem_event_filter(struct event_subsystem *system,
mutex_lock(&event_mutex);
mutex_lock(&event_mutex);
+ /* Make sure the system still has events */
+ if (!system->nr_events) {
+ err = -ENODEV;
+ goto out_unlock;
+ }
+
if (!strcmp(strstrip(filter_string), "0")) {
filter_free_subsystem_preds(system);
remove_filter_string(system->filter);
if (!strcmp(strstrip(filter_string), "0")) {
filter_free_subsystem_preds(system);
remove_filter_string(system->filter);