linux-kernel - Re: [PATCH 12/21] pinctrl: k210: Use scope based of_node

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Date: Thu, 2 May 2024 18:45:09 +0900
From: Damien Le Moal <dlemoal@...nel.org>
To: "Peng Fan (OSS)" <peng.fan@....nxp.com>,
 Linus Walleij <linus.walleij@...aro.org>,
 Thierry Reding <thierry.reding@...il.com>,
 Jonathan Hunter <jonathanh@...dia.com>, Dvorkin Dmitry <dvorkin@...bo.com>,
 Wells Lu <wellslutw@...il.com>, Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Emil Renner Berthing <kernel@...il.dk>,
 Jianlong Huang <jianlong.huang@...rfivetech.com>,
 Hal Feng <hal.feng@...rfivetech.com>, Orson Zhai <orsonzhai@...il.com>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>,
 Chunyan Zhang <zhang.lyra@...il.com>, Viresh Kumar <vireshk@...nel.org>,
 Shiraz Hashim <shiraz.linux.kernel@...il.com>, soc@...nel.org,
 Krzysztof Kozlowski <krzk@...nel.org>,
 Sylwester Nawrocki <s.nawrocki@...sung.com>,
 Alim Akhtar <alim.akhtar@...sung.com>,
 Geert Uytterhoeven <geert+renesas@...der.be>,
 Patrice Chotard <patrice.chotard@...s.st.com>,
 Heiko Stuebner <heiko@...ech.de>,
 Ludovic Desroches <ludovic.desroches@...rochip.com>,
 Nicolas Ferre <nicolas.ferre@...rochip.com>,
 Alexandre Belloni <alexandre.belloni@...tlin.com>,
 Claudiu Beznea <claudiu.beznea@...on.dev>,
 Dong Aisheng <aisheng.dong@....com>, Fabio Estevam <festevam@...il.com>,
 Shawn Guo <shawnguo@...nel.org>, Jacky Bai <ping.bai@....com>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 Chester Lin <chester62515@...il.com>, Matthias Brugger <mbrugger@...e.com>,
 Ghennadi Procopciuc <ghennadi.procopciuc@....nxp.com>,
 Sean Wang <sean.wang@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Sascha Hauer <s.hauer@...gutronix.de>,
 Andrew Jeffery <andrew@...econstruct.com.au>, Joel Stanley <joel@....id.au>,
 Dan Carpenter <dan.carpenter@...aro.org>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-tegra@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-stm32@...md-mailman.stormreply.com, linux-samsung-soc@...r.kernel.org,
 linux-renesas-soc@...r.kernel.org, linux-rockchip@...ts.infradead.org,
 linux-riscv@...ts.infradead.org, linux-mediatek@...ts.infradead.org,
 imx@...ts.linux.dev, linux-aspeed@...ts.ozlabs.org,
 openbmc@...ts.ozlabs.org, Peng Fan <peng.fan@....com>
Subject: Re: [PATCH 12/21] pinctrl: k210: Use scope based of_node_put()
 cleanups

On 5/1/24 21:56, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
> 
> Use scope based of_node_put() cleanup to simplify code.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/pinctrl/pinctrl-k210.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-k210.c b/drivers/pinctrl/pinctrl-k210.c
> index b6d1ed9ec9a3..2753e14c3e38 100644
> --- a/drivers/pinctrl/pinctrl-k210.c
> +++ b/drivers/pinctrl/pinctrl-k210.c
> @@ -849,7 +849,6 @@ static int k210_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
>  				       unsigned int *num_maps)
>  {
>  	unsigned int reserved_maps;
> -	struct device_node *np;
>  	int ret;
>  
>  	reserved_maps = 0;
> @@ -861,13 +860,11 @@ static int k210_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
>  	if (ret < 0)
>  		goto err;
>  
> -	for_each_available_child_of_node(np_config, np) {
> +	for_each_available_child_of_node_scoped(np_config, np) {
>  		ret = k210_pinctrl_dt_subnode_to_map(pctldev, np, map,
>  						     &reserved_maps, num_maps);
> -		if (ret < 0) {
> -			of_node_put(np);

Personally, I am really not a fan of things that hide code like that scoped
thing... If I want a language that hides code, I would be doing C++ :)
That said, I am not opposed to this so I will let Linus (Walleij) decide.

Also, I think that "for_each_available_child_of_node" is a bad name... It really
should be something like for_each_available_child_of_node_get() to make it clear
that a of_node_put() is needed.

> +		if (ret < 0)
>  			goto err;
> -		}
>  	}
>  	return 0;
>  
> 

-- 
Damien Le Moal
Western Digital Research