linux-kernel - Re: [PATCH 01/10] pmdomain: rockchip: Simplify with scoped for each OF child loop

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Message-ID: <20240827105343.00003a72@Huawei.com>
Date: Tue, 27 Aug 2024 10:53:43 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
CC: Ulf Hansson <ulf.hansson@...aro.org>, Heiko Stuebner <heiko@...ech.de>,
	Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>, Fabio Estevam
	<festevam@...il.com>, Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio
	<konradybcio@...nel.org>, Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>, <linux-pm@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-rockchip@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <imx@...ts.linux.dev>,
	<linux-arm-msm@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH 01/10] pmdomain: rockchip: Simplify with scoped for each
 OF child loop

On Fri, 23 Aug 2024 14:51:05 +0200
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:

> Use scoped for_each_available_child_of_node_scoped() and
> for_each_child_of_node_scoped() when iterating over
> device nodes to make code a bit simpler.
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Ripe for some dev_err_probe() usage that will make this even nicer
as a cleanup.

Looks good as it stands
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

> ---
>  drivers/pmdomain/rockchip/pm-domains.c | 20 ++++++--------------
>  1 file changed, 6 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/pmdomain/rockchip/pm-domains.c b/drivers/pmdomain/rockchip/pm-domains.c
> index 64b4d7120d83..5679ad336a11 100644
> --- a/drivers/pmdomain/rockchip/pm-domains.c
> +++ b/drivers/pmdomain/rockchip/pm-domains.c
> @@ -804,11 +804,10 @@ static void rockchip_configure_pd_cnt(struct rockchip_pmu *pmu,
>  static int rockchip_pm_add_subdomain(struct rockchip_pmu *pmu,
>  				     struct device_node *parent)
>  {
> -	struct device_node *np;
>  	struct generic_pm_domain *child_domain, *parent_domain;
>  	int error;
>  
> -	for_each_child_of_node(parent, np) {
> +	for_each_child_of_node_scoped(parent, np) {
>  		u32 idx;
>  
>  		error = of_property_read_u32(parent, "reg", &idx);
> @@ -816,7 +815,7 @@ static int rockchip_pm_add_subdomain(struct rockchip_pmu *pmu,
>  			dev_err(pmu->dev,
>  				"%pOFn: failed to retrieve domain id (reg): %d\n",
>  				parent, error);
> -			goto err_out;
> +			return error;
>  		}
>  		parent_domain = pmu->genpd_data.domains[idx];
>  
> @@ -824,7 +823,7 @@ static int rockchip_pm_add_subdomain(struct rockchip_pmu *pmu,
>  		if (error) {
>  			dev_err(pmu->dev, "failed to handle node %pOFn: %d\n",
>  				np, error);
> -			goto err_out;
> +			return error;
>  		}
>  
>  		error = of_property_read_u32(np, "reg", &idx);
> @@ -832,7 +831,7 @@ static int rockchip_pm_add_subdomain(struct rockchip_pmu *pmu,
>  			dev_err(pmu->dev,
>  				"%pOFn: failed to retrieve domain id (reg): %d\n",
>  				np, error);
> -			goto err_out;
> +			return error;
>  		}
>  		child_domain = pmu->genpd_data.domains[idx];
>  
> @@ -840,7 +839,7 @@ static int rockchip_pm_add_subdomain(struct rockchip_pmu *pmu,
>  		if (error) {
>  			dev_err(pmu->dev, "%s failed to add subdomain %s: %d\n",
>  				parent_domain->name, child_domain->name, error);
> -			goto err_out;
> +			return error;
>  		} else {
>  			dev_dbg(pmu->dev, "%s add subdomain: %s\n",
>  				parent_domain->name, child_domain->name);
> @@ -850,17 +849,12 @@ static int rockchip_pm_add_subdomain(struct rockchip_pmu *pmu,
>  	}
>  
>  	return 0;
> -
> -err_out:
> -	of_node_put(np);
> -	return error;
>  }
>  
>  static int rockchip_pm_domain_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
>  	struct device_node *np = dev->of_node;
> -	struct device_node *node;
>  	struct device *parent;
>  	struct rockchip_pmu *pmu;
>  	const struct rockchip_pmu_info *pmu_info;
> @@ -918,12 +912,11 @@ static int rockchip_pm_domain_probe(struct platform_device *pdev)
>  	 */
>  	mutex_lock(&dmc_pmu_mutex);
>  
> -	for_each_available_child_of_node(np, node) {
> +	for_each_available_child_of_node_scoped(np, node) {
>  		error = rockchip_pm_add_one_domain(pmu, node);
>  		if (error) {
>  			dev_err(dev, "failed to handle node %pOFn: %d\n",
>  				node, error);
> -			of_node_put(node);
>  			goto err_out;
>  		}
>  
> @@ -931,7 +924,6 @@ static int rockchip_pm_domain_probe(struct platform_device *pdev)
>  		if (error < 0) {
>  			dev_err(dev, "failed to handle subdomain node %pOFn: %d\n",
>  				node, error);
> -			of_node_put(node);
>  			goto err_out;
>  		}
>  	}
>