static void tty_del_file(struct file *file)
{
	struct tty_file_private *priv = file->private_data;

	spin_lock(&tty_files_lock);
	list_del(&priv->list);
	spin_unlock(&tty_files_lock);
	tty_free_file(file);
}

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.