diff options
| -rw-r--r-- | kernel/trace/blktrace.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index 8cea91d248d98..b2058a7f94bd8 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -470,12 +470,12 @@ static int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, if (!blk_debugfs_root) goto err; - dir = debugfs_create_dir(buts->name, blk_debugfs_root); - + dir = debugfs_lookup(buts->name, blk_debugfs_root); + if (!dir) + bt->dir = dir = debugfs_create_dir(buts->name, blk_debugfs_root); if (!dir) goto err; - bt->dir = dir; bt->dev = dev; atomic_set(&bt->dropped, 0); INIT_LIST_HEAD(&bt->running_list); @@ -517,9 +517,12 @@ static int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, if (atomic_inc_return(&blk_probes_ref) == 1) blk_register_tracepoints(); - return 0; + ret = 0; err: - blk_trace_free(bt); + if (dir && !bt->dir) + dput(dir); + if (ret) + blk_trace_free(bt); return ret; } |