linux-kernel - Re: [PATCH v2] phy: core: Check requested PHY status in _of_phy

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Message-ID: <20150407063800.GA3461@x1>
Date:	Tue, 7 Apr 2015 07:38:00 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Axel Lin <axel.lin@...ics.com>
Cc:	Kishon Vijay Abraham I <kishon@...com>,
	Gabriel FERNANDEZ <gabriel.fernandez@...com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] phy: core: Check requested PHY status in _of_phy_get()

On Tue, 07 Apr 2015, Axel Lin wrote:

> This is a common checking in various drivers, so move the checking to
> _of_phy_get().
> 
> Signed-off-by: Axel Lin <axel.lin@...ics.com>
> ---
> v2: Fixup the error patch. It needs to call module_put if Requested PHY is
>     disabled.
>  drivers/phy/phy-core.c      | 12 ++++++++++--
>  drivers/phy/phy-miphy28lp.c |  5 -----
>  drivers/phy/phy-miphy365x.c |  5 -----

Acked-by: Lee Jones <lee.jones@...aro.org>

>  drivers/phy/phy-rcar-gen2.c |  5 -----
>  4 files changed, 10 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
> index 3791838f..f7403de 100644
> --- a/drivers/phy/phy-core.c
> +++ b/drivers/phy/phy-core.c
> @@ -367,13 +367,21 @@ static struct phy *_of_phy_get(struct device_node *np, int index)
>  	phy_provider = of_phy_provider_lookup(args.np);
>  	if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner)) {
>  		phy = ERR_PTR(-EPROBE_DEFER);
> -		goto err0;
> +		goto out_unlock;
> +	}
> +
> +	if (!of_device_is_available(args.np)) {
> +		dev_warn(phy_provider->dev, "Requested PHY is disabled\n");
> +		phy = ERR_PTR(-ENODEV);
> +		goto out_put_module;
>  	}
>  
>  	phy = phy_provider->of_xlate(phy_provider->dev, &args);
> +
> +out_put_module:
>  	module_put(phy_provider->owner);
>  
> -err0:
> +out_unlock:
>  	mutex_unlock(&phy_provider_mutex);
>  	of_node_put(args.np);
>  
> diff --git a/drivers/phy/phy-miphy28lp.c b/drivers/phy/phy-miphy28lp.c
> index 9334352..cc87b3f 100644
> --- a/drivers/phy/phy-miphy28lp.c
> +++ b/drivers/phy/phy-miphy28lp.c
> @@ -1107,11 +1107,6 @@ static struct phy *miphy28lp_xlate(struct device *dev,
>  	struct device_node *phynode = args->np;
>  	int ret, index = 0;
>  
> -	if (!of_device_is_available(phynode)) {
> -		dev_warn(dev, "Requested PHY is disabled\n");
> -		return ERR_PTR(-ENODEV);
> -	}
> -
>  	if (args->args_count != 1) {
>  		dev_err(dev, "Invalid number of cells in 'phy' property\n");
>  		return ERR_PTR(-EINVAL);
> diff --git a/drivers/phy/phy-miphy365x.c b/drivers/phy/phy-miphy365x.c
> index 51b459d..d29b332 100644
> --- a/drivers/phy/phy-miphy365x.c
> +++ b/drivers/phy/phy-miphy365x.c
> @@ -476,11 +476,6 @@ static struct phy *miphy365x_xlate(struct device *dev,
>  	struct device_node *phynode = args->np;
>  	int ret, index;
>  
> -	if (!of_device_is_available(phynode)) {
> -		dev_warn(dev, "Requested PHY is disabled\n");
> -		return ERR_PTR(-ENODEV);
> -	}
> -
>  	if (args->args_count != 1) {
>  		dev_err(dev, "Invalid number of cells in 'phy' property\n");
>  		return ERR_PTR(-EINVAL);
> diff --git a/drivers/phy/phy-rcar-gen2.c b/drivers/phy/phy-rcar-gen2.c
> index 778276a..f47bfd8 100644
> --- a/drivers/phy/phy-rcar-gen2.c
> +++ b/drivers/phy/phy-rcar-gen2.c
> @@ -206,11 +206,6 @@ static struct phy *rcar_gen2_phy_xlate(struct device *dev,
>  	struct device_node *np = args->np;
>  	int i;
>  
> -	if (!of_device_is_available(np)) {
> -		dev_warn(dev, "Requested PHY is disabled\n");
> -		return ERR_PTR(-ENODEV);
> -	}
> -
>  	drv = dev_get_drvdata(dev);
>  	if (!drv)
>  		return ERR_PTR(-EINVAL);

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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