[PATCH v2 2.6.38-rc8-tip 5/20] 5: Uprobes: register/unregister probes.

[Steven Rostedt]

On Mon, 2011-03-14 at 19:04 +0530, Srikar Dronamraju wrote:
> +/* Returns 0 if it can install one probe */
> +int register_uprobe(struct inode *inode, loff_t offset,
> +                               struct uprobe_consumer *consumer)
> +{
> +       struct prio_tree_iter iter;
> +       struct list_head tmp_list;
> +       struct address_space *mapping;
> +       struct mm_struct *mm, *tmpmm;
> +       struct vm_area_struct *vma;
> +       struct uprobe *uprobe;
> +       int ret = -1;
> +
> +       if (!inode || !consumer || consumer->next)
> +               return -EINVAL;
> +       uprobe = uprobes_add(inode, offset);

What happens if uprobes_add() returns NULL?

-- Steve

> +       INIT_LIST_HEAD(&tmp_list);
> +
> +       mapping = inode->i_mapping;
> +
> +       mutex_lock(&uprobes_mutex);
> +       if (uprobe->consumers) {
> +               ret = 0;
> +               goto consumers_add;
> +       }