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Subject: Re: [PATCH v2 2.6.38-rc8-tip 5/20]  5: Uprobes:
 register/unregister probes.
From: Steven Rostedt <rostedt@goodmis.org>
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Date: Mon, 14 Mar 2011 12:00:33 -0400
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Sender: owner-linux-mm@kvack.org
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To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@elte.hu>, Linux-mm <linux-mm@kvack.org>, Arnaldo Carvalho de Melo <acme@infradead.org>, Linus Torvalds <torvalds@linux-foundation.org>, Christoph Hellwig <hch@infradead.org>, Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>, Ananth N Mavinakayanahalli <ananth@in.ibm.com>, Oleg Nesterov <oleg@redhat.com>, LKML <linux-kernel@vger.kernel.org>, SystemTap <systemtap@sources.redhat.com>, Jim Keniston <jkenisto@linux.vnet.ibm.com>, Roland McGrath <roland@hack.frob.com>, Andi Kleen <andi@firstfloor.org>, Andrew Morton <akpm@linux-foundation.org>, "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>

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;
> +       } 

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