linux-kernel - Re: [PATCH 4/7] phy: rockchip-usb: add missing of_node

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Date:	Wed, 18 Nov 2015 22:42:32 +0100
From:	Heiko Stübner <heiko@...ech.de>
To:	Julia Lawall <Julia.Lawall@...6.fr>
Cc:	Kishon Vijay Abraham I <kishon@...com>,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.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>
Subject: Re: [PATCH 4/7] phy: rockchip-usb: add missing of_node_put

Am Montag, 16. November 2015, 12:33:17 schrieb Julia Lawall:
> for_each_available_child_of_node performs an of_node_get on each iteration,
> so a return from the middle of the loop requires an of_node_put.
> 
> A simplified version of the semantic patch that finds 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;
> 
> *  return ...;
> )
>    ...
>  }
> // </smpl>
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

After 

Reviewed-by: Heiko Stuebner <heiko@...ech.de>

on a rk3288-veyron chromebook
Tested-by: Heiko Stuebner <heiko@...ech.de>

> 
> ---
>  drivers/phy/phy-rockchip-usb.c |   17 ++++++++++++-----
>  1 file changed, 12 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/phy/phy-rockchip-usb.c b/drivers/phy/phy-rockchip-usb.c
> index 91d6f34..62c43c4 100644
> --- a/drivers/phy/phy-rockchip-usb.c
> +++ b/drivers/phy/phy-rockchip-usb.c
> @@ -108,13 +108,16 @@ static int rockchip_usb_phy_probe(struct
> platform_device *pdev)
> 
>  	for_each_available_child_of_node(dev->of_node, child) {
>  		rk_phy = devm_kzalloc(dev, sizeof(*rk_phy), GFP_KERNEL);
> -		if (!rk_phy)
> -			return -ENOMEM;
> +		if (!rk_phy) {
> +			err = -ENOMEM;
> +			goto put_child;
> +		}
> 
>  		if (of_property_read_u32(child, "reg", &reg_offset)) {
>  			dev_err(dev, "missing reg property in node %s\n",
>  				child->name);
> -			return -EINVAL;
> +			err = -EINVAL;
> +			goto put_child;
>  		}
> 
>  		rk_phy->reg_offset = reg_offset;
> @@ -127,18 +130,22 @@ static int rockchip_usb_phy_probe(struct
> platform_device *pdev) rk_phy->phy = devm_phy_create(dev, child, &ops);
>  		if (IS_ERR(rk_phy->phy)) {
>  			dev_err(dev, "failed to create PHY\n");
> -			return PTR_ERR(rk_phy->phy);
> +			err = PTR_ERR(rk_phy->phy);
> +			goto put_child;
>  		}
>  		phy_set_drvdata(rk_phy->phy, rk_phy);
> 
>  		/* only power up usb phy when it use, so disable it when init*/
>  		err = rockchip_usb_phy_power(rk_phy, 1);
>  		if (err)
> -			return err;
> +			goto put_child;
>  	}
> 
>  	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
>  	return PTR_ERR_OR_ZERO(phy_provider);
> +put_child:
> +	of_node_put(child);
> +	return err;
>  }
> 
>  static const struct of_device_id rockchip_usb_phy_dt_ids[] = {

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