Merge branch 'master' into upstream-fixes

1 files changed, 7 insertions, 2 deletions

diff --git a/block/blktrace.c b/block/blktrace.c
index d00ac3993c1..498a0a54a6a 100644
--- a/block/blktrace.c
+++ b/block/blktrace.c
@@ -202,6 +202,7 @@ static void blk_remove_tree(struct dentry *dir)
 static struct dentry *blk_create_tree(const char *blk_name)
 {
 	struct dentry *dir = NULL;
+	int created = 0;
 
 	mutex_lock(&blk_tree_mutex);
 
@@ -209,13 +210,17 @@ static struct dentry *blk_create_tree(const char *blk_name)
 		blk_tree_root = debugfs_create_dir("block", NULL);
 		if (!blk_tree_root)
 			goto err;
+		created = 1;
 	}
 
 	dir = debugfs_create_dir(blk_name, blk_tree_root);
 	if (dir)
 		root_users++;
-	else
-		blk_remove_root();
+	else {
+		/* Delete root only if we created it */
+		if (created)
+			blk_remove_root();
+	}
 
 err:
 	mutex_unlock(&blk_tree_mutex);