linux-kernel - Re: [PATCH v5 3.1.0-rc4-tip 3/26] Uprobes: register/unregister probes.

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Message-ID: <20110920165019.GA27959@stefanha-thinkpad.localdomain>
Date:	Tue, 20 Sep 2011 17:50:19 +0100
From:	Stefan Hajnoczi <stefanha@...ux.vnet.ibm.com>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jonathan Corbet <corbet@....net>,
	Hugh Dickins <hughd@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andi Kleen <andi@...stfloor.org>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v5 3.1.0-rc4-tip 3/26]   Uprobes: register/unregister
 probes.

On Tue, Sep 20, 2011 at 05:30:22PM +0530, Srikar Dronamraju wrote:
> +int register_uprobe(struct inode *inode, loff_t offset,
> +				struct uprobe_consumer *consumer)
> +{
> +	struct uprobe *uprobe;
> +	int ret = 0;
> +
> +	inode = igrab(inode);
> +	if (!inode || !consumer || consumer->next)
> +		return -EINVAL;
> +
> +	if (offset > inode->i_size)
> +		return -EINVAL;
> +
> +	mutex_lock(&inode->i_mutex);
> +	uprobe = alloc_uprobe(inode, offset);
> +	if (!uprobe)
> +		return -ENOMEM;

The error returns above don't iput(inode).  And inode->i_mutex stays
locked on this return.

> +void unregister_uprobe(struct inode *inode, loff_t offset,
> +				struct uprobe_consumer *consumer)
> +{
> +	struct uprobe *uprobe;
> +
> +	inode = igrab(inode);
> +	if (!inode || !consumer)
> +		return;
> +
> +	if (offset > inode->i_size)
> +		return;
> +
> +	uprobe = find_uprobe(inode, offset);
> +	if (!uprobe)
> +		return;
> +
> +	if (!del_consumer(uprobe, consumer)) {
> +		put_uprobe(uprobe);
> +		return;
> +	}

More returns that do not iput(inode).

Stefan
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