linux-kernel - Re: [PATCH V3 1/3] pinctrl: ti: iodelay: Use scope based of_node

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Date: Mon, 1 Jul 2024 13:54:40 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: "Peng Fan (OSS)" <peng.fan@....nxp.com>
CC: <linus.walleij@...aro.org>, <dan.carpenter@...aro.org>,
	<linux-gpio@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <aisheng.dong@....com>, <festevam@...il.com>,
	<shawnguo@...nel.org>, <kernel@...gutronix.de>,
	<u.kleine-koenig@...gutronix.de>, Peng Fan <peng.fan@....com>
Subject: Re: [PATCH V3 1/3] pinctrl: ti: iodelay: Use scope based
 of_node_put() cleanups

On Thu, 27 Jun 2024 21:17:19 +0800
"Peng Fan (OSS)" <peng.fan@....nxp.com> 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>
A couple of comments on additional cleanups - primarily
using return dev_err_probe() - enabled by using scope based
cleanup to avoid the goto dance.

Either way LGTM
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

> ---
>  drivers/pinctrl/ti/pinctrl-ti-iodelay.c | 43 +++++++++----------------
>  1 file changed, 15 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/pinctrl/ti/pinctrl-ti-iodelay.c b/drivers/pinctrl/ti/pinctrl-ti-iodelay.c
> index ef9758638501..f5e5a23d2226 100644
> --- a/drivers/pinctrl/ti/pinctrl-ti-iodelay.c
> +++ b/drivers/pinctrl/ti/pinctrl-ti-iodelay.c
> @@ -822,53 +822,48 @@ MODULE_DEVICE_TABLE(of, ti_iodelay_of_match);
>  static int ti_iodelay_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> -	struct device_node *np = of_node_get(dev->of_node);
> +	struct device_node *np __free(device_node) = of_node_get(dev->of_node);
>  	struct resource *res;
>  	struct ti_iodelay_device *iod;
> -	int ret = 0;
> +	int ret;
>  
>  	if (!np) {
> -		ret = -EINVAL;
>  		dev_err(dev, "No OF node\n");
> -		goto exit_out;
> +		return -EINVAL;
Whilst you are here can use more compact
		return dev_err_probe(dev, -EINVAL, "No OF node\n");
for all error prints in a probe() function.
They do various nice things on deferred probe but are
useful more generally.

>  	}
>  
>  	iod = devm_kzalloc(dev, sizeof(*iod), GFP_KERNEL);
> -	if (!iod) {
> -		ret = -ENOMEM;
> -		goto exit_out;
> -	}
> +	if (!iod)
> +		return -ENOMEM;
> +
>  	iod->dev = dev;
>  	iod->reg_data = device_get_match_data(dev);
>  	if (!iod->reg_data) {
> -		ret = -EINVAL;
>  		dev_err(dev, "No DATA match\n");
> -		goto exit_out;
> +		return -EINVAL;

return dev_err_probe() works here as well and in 
other cases below. It's an added bonus __free() magic often enables.

No idea why DATA is in capitals and to be honest it's not
a particularly useful error message.  What data? :)

>  	}


>  }
>  
>  /**