linux-kernel - Re: [PATCH 6/6] phy: core: Simplify API of_phy_simple

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Message-ID: <8adbf600-b8c1-4d3d-a6b0-8f18482742aa@icloud.com>
Date: Sun, 20 Oct 2024 18:19:09 +0800
From: Zijun Hu <zijun_hu@...oud.com>
To: Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I
 <kishon@...nel.org>, Felipe Balbi <balbi@...com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Rob Herring <robh@...nel.org>, Arnd Bergmann <arnd@...db.de>,
 Lee Jones <lee@...nel.org>
Cc: stable@...r.kernel.org, linux-phy@...ts.infradead.org,
 netdev@...r.kernel.org, linux-pci@...r.kernel.org,
 linux-kernel@...r.kernel.org, Zijun Hu <quic_zijuhu@...cinc.com>
Subject: Re: [PATCH 6/6] phy: core: Simplify API of_phy_simple_xlate()
 implementation

On 2024/10/20 13:27, Zijun Hu wrote:
> From: Zijun Hu <quic_zijuhu@...cinc.com>
> 
> Simplify of_phy_simple_xlate() implementation by API
> class_find_device_by_of_node() which is also safer since it
> subsys_get() @phy_class subsystem firstly then iterates devices.
> 
> Also comment its parameter @dev with unused in passing since the parameter
> provides no available input info but acts as an auto variable.
> 
i am not sure which parameter is unused. @dev or @args

comment says @args is not used here
but code actually uses @args but does not use @dev

> Signed-off-by: Zijun Hu <quic_zijuhu@...cinc.com>
> ---
>  drivers/phy/phy-core.c | 19 ++++++-------------
>  1 file changed, 6 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
> index 24bd619a33dd..102fc6b6ff71 100644
> --- a/drivers/phy/phy-core.c
> +++ b/drivers/phy/phy-core.c
> @@ -748,7 +748,7 @@ EXPORT_SYMBOL_GPL(devm_phy_put);
>  
>  /**
>   * of_phy_simple_xlate() - returns the phy instance from phy provider
> - * @dev: the PHY provider device
> + * @dev: the PHY provider device unused
>   * @args: of_phandle_args (not used here)
>   *
>   * Intended to be used by phy provider for the common case where #phy-cells is
> @@ -759,20 +759,13 @@ EXPORT_SYMBOL_GPL(devm_phy_put);
>  struct phy *of_phy_simple_xlate(struct device *dev,
>  				const struct of_phandle_args *args)
>  {
> -	struct phy *phy;
> -	struct class_dev_iter iter;
> -
> -	class_dev_iter_init(&iter, &phy_class, NULL, NULL);
> -	while ((dev = class_dev_iter_next(&iter))) {
> -		phy = to_phy(dev);
> -		if (args->np != phy->dev.of_node)
> -			continue;
> +	struct device *target_dev;
>  
> -		class_dev_iter_exit(&iter);
> -		return phy;
> +	target_dev = class_find_device_by_of_node(&phy_class, args->np);
> +	if (target_dev) {
> +		put_device(target_dev);
> +		return to_phy(target_dev);
>  	}
> -
> -	class_dev_iter_exit(&iter);
>  	return ERR_PTR(-ENODEV);
>  }
>  EXPORT_SYMBOL_GPL(of_phy_simple_xlate);
>