diff --git a/drbd/drbd_debugfs.c b/drbd/drbd_debugfs.c
index 91292c3..959a576 100644
--- a/drbd/drbd_debugfs.c
+++ b/drbd/drbd_debugfs.c
@@ -1074,7 +1074,7 @@ static int drbd_single_open_peer_device(struct file *file,
 	parent = file->f_path.dentry->d_parent;
 	if (!parent || !parent->d_inode)
 		goto out;
-	mutex_lock(&parent->d_inode->i_mutex);
+	inode_lock(d_inode(parent));
 	if (!simple_positive(file->f_path.dentry))
 		goto out_unlock;
 
@@ -1083,7 +1083,7 @@ static int drbd_single_open_peer_device(struct file *file,
 
 	if (got_connection && got_device) {
 		int ret;
-		mutex_unlock(&parent->d_inode->i_mutex);
+		inode_unlock(d_inode(parent));
 		ret = single_open(file, show, peer_device);
 		if (ret) {
 			kref_put(&connection->kref, drbd_destroy_connection);
@@ -1097,7 +1097,7 @@ static int drbd_single_open_peer_device(struct file *file,
 	if (got_device)
 		kref_put(&device->kref, drbd_destroy_device);
 out_unlock:
-	mutex_unlock(&parent->d_inode->i_mutex);
+	inode_unlock(d_inode(parent));
 out:
 	return -ESTALE;
 }