linux-kernel - Re: [PATCH 3/7] drivers/mtd/nand/mpc5121_nfc.c: Add of_node

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Date:	Sun, 29 Aug 2010 17:47:44 +0200
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	Julia Lawall <julia@...u.dk>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	linux-mtd@...ts.infradead.org, devicetree-discuss@...ts.ozlabs.org,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 3/7] drivers/mtd/nand/mpc5121_nfc.c: Add of_node_put to
	avoid memory leak

On Sun, Aug 29, 2010 at 11:52:42AM +0200, Julia Lawall wrote:
> Add a call to of_node_put in the error handling code following a call to
> of_find_compatible_node.
> 
> The semantic match that finds this problem is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @r exists@
> local idexpression x;
> expression E,E1;
> statement S;
> @@
> 
> *x = 
> (of_find_node_by_path
> |of_find_node_by_name
> |of_find_node_by_phandle
> |of_get_parent
> |of_get_next_parent
> |of_get_next_child
> |of_find_compatible_node
> |of_match_node
> )(...);
> ...
> if (x == NULL) S
> <... when != x = E
> *if (...) {
>   ... when != of_node_put(x)
>       when != if (...) { ... of_node_put(x); ... }
> (
>   return <+...x...+>;
> |
> *  return ...;
> )
> }
> ...>
> of_node_put(x);
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>

Acked-by: Wolfram Sang <w.sang@...gutronix.de>

adding ppc-list to cc.

> 
> ---
>  drivers/mtd/nand/mpc5121_nfc.c |    7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mtd/nand/mpc5121_nfc.c b/drivers/mtd/nand/mpc5121_nfc.c
> index df0c1da..f4610bc 100644
> --- a/drivers/mtd/nand/mpc5121_nfc.c
> +++ b/drivers/mtd/nand/mpc5121_nfc.c
> @@ -568,6 +568,7 @@ static int mpc5121_nfc_read_hw_config(struct mtd_info *mtd)
>  	uint rcw_width;
>  	uint rcwh;
>  	uint romloc, ps;
> +	int ret = 0;
>  
>  	rmnode = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-reset");
>  	if (!rmnode) {
> @@ -579,7 +580,8 @@ static int mpc5121_nfc_read_hw_config(struct mtd_info *mtd)
>  	rm = of_iomap(rmnode, 0);
>  	if (!rm) {
>  		dev_err(prv->dev, "Error mapping reset module node!\n");
> -		return -EBUSY;
> +		ret = -EBUSY;
> +		goto out;
>  	}
>  
>  	rcwh = in_be32(&rm->rcwhr);
> @@ -628,8 +630,9 @@ static int mpc5121_nfc_read_hw_config(struct mtd_info *mtd)
>  				rcw_width * 8, rcw_pagesize,
>  				rcw_sparesize);
>  	iounmap(rm);
> +out:
>  	of_node_put(rmnode);
> -	return 0;
> +	return ret;
>  }
>  
>  /* Free driver resources */
> 
> _______________________________________________
> devicetree-discuss mailing list
> devicetree-discuss@...ts.ozlabs.org
> https://lists.ozlabs.org/listinfo/devicetree-discuss

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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