linux-kernel - Re: [PATCH] usb: chipidea: Use of_property

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Message-ID: <20240809012109.GB2673490@nchen-desktop>
Date: Fri, 9 Aug 2024 09:21:09 +0800
From: Peter Chen <peter.chen@...nel.org>
To: "Rob Herring (Arm)" <robh@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, linux-usb@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: chipidea: Use of_property_present()

On 24-07-31 13:12:56, Rob Herring (Arm) wrote:
> Use of_property_present() to test for property presence rather than
> of_get_property(). This is part of a larger effort to remove callers
> of of_get_property() and similar functions. of_get_property() leaks
> the DT property data pointer which is a problem for dynamically
> allocated nodes which may be freed.
> 
> Signed-off-by: Rob Herring (Arm) <robh@...nel.org>

Acked-by: Peter Chen <peter.chen@...nel.org>

> ---
>  drivers/usb/chipidea/ci_hdrc_imx.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
> index bdc04ce919f7..c64ab0e07ea0 100644
> --- a/drivers/usb/chipidea/ci_hdrc_imx.c
> +++ b/drivers/usb/chipidea/ci_hdrc_imx.c
> @@ -128,7 +128,7 @@ static struct imx_usbmisc_data *usbmisc_get_init_data(struct device *dev)
>  	 * In case the fsl,usbmisc property is not present this device doesn't
>  	 * need usbmisc. Return NULL (which is no error here)
>  	 */
> -	if (!of_get_property(np, "fsl,usbmisc", NULL))
> +	if (!of_property_present(np, "fsl,usbmisc"))
>  		return NULL;
>  
>  	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> -- 
> 2.43.0
>