diff options
Diffstat (limited to 'kernel/trace/trace_events.c')
| -rw-r--r-- | kernel/trace/trace_events.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c index 439955239bae..58a61302a733 100644 --- a/kernel/trace/trace_events.c +++ b/kernel/trace/trace_events.c @@ -1754,16 +1754,22 @@ int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) struct dentry *d_events; struct dentry *entry; + mutex_lock(&event_mutex); + entry = debugfs_create_file("set_event", 0644, parent, tr, &ftrace_set_event_fops); if (!entry) { pr_warning("Could not create debugfs 'set_event' entry\n"); + mutex_unlock(&event_mutex); return -ENOMEM; } d_events = debugfs_create_dir("events", parent); - if (!d_events) + if (!d_events) { pr_warning("Could not create debugfs 'events' directory\n"); + mutex_unlock(&event_mutex); + return -ENOMEM; + } /* ring buffer internal formats */ trace_create_file("header_page", 0444, d_events, @@ -1778,7 +1784,11 @@ int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) tr, &ftrace_tr_enable_fops); tr->event_dir = d_events; + down_write(&trace_event_mutex); __trace_add_event_dirs(tr); + up_write(&trace_event_mutex); + + mutex_unlock(&event_mutex); return 0; } |