linux-kernel - Re: [PATCH 1/4 v2] mtd: brcmnand: improve memory management

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Message-ID: <20151201015615.GV64635@google.com>
Date:	Mon, 30 Nov 2015 17:56:15 -0800
From:	Brian Norris <computersforpeace@...il.com>
To:	Julia Lawall <julia.lawall@...6.fr>
Cc:	kernel-janitors@...r.kernel.org,
	David Woodhouse <dwmw2@...radead.org>,
	linux-mtd@...ts.infradead.org,
	bcm-kernel-feedback-list@...adcom.com,
	linux-kernel@...r.kernel.org,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Andrew Lunn <andrew@...n.ch>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jason Cooper <jason@...edaemon.net>,
	Kamal Dasu <kdasu.kdev@...il.com>
Subject: Re: [PATCH 1/4 v2] mtd: brcmnand: improve memory management

On Thu, Nov 19, 2015 at 10:32:15PM +0100, Julia Lawall wrote:
> This patch addresses two related memory management issues in the probe
> function:
> 
> 1. for_each_available_child_of_node performs an of_node_get on each
> iteration, so a break out of the loop requires an of_node_put.
> 
> A simplified version of the semantic patch that fixes this problem is as
> follows (http://coccinelle.lip6.fr):
> 
> // <smpl>
> @@
> expression root,e;
> local idexpression child;
> @@
> 
>  for_each_available_child_of_node(root, child) {
>    ... when != of_node_put(child)
>        when != e = child
> (
>    return child;
> |
> +  of_node_put(child);
> ?  return ...;
> )
>    ...
>  }
> // </smpl>
> 
> 2. The devm_kzalloc'd data is not used if brcmnand_init_cs fails.  Free it
> immediately, using devm_kfree in this case, instead of waiting for the
> remove function.
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
> 
> ---
> 
> v2: Drop of_node_get addition, as another patch will get rid of the need
> for it completely.

Pushed to l2-mtd.git
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