linux-kernel - Re: [PATCH] usb: typec: ucsi: glink: use device_for_each_child_node

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Date: Tue, 25 Jun 2024 17:30:21 +0300
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Javier Carrasco <javier.carrasco.cruz@...il.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: typec: ucsi: glink: use
 device_for_each_child_node_scoped()

On Sun, Jun 23, 2024 at 12:35:11PM +0200, Javier Carrasco wrote:
> Use the scoped variant of `device_for_each_child_node()` to
> automatically handle early exits.
> 
> This prevents memory leaks if new error paths are introduced,
> as no explicit refcount decrement via `fwnode_handle_put()` is needed.
> 
> Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
> This patch is a follow-up to the recently introduced commit c68942624e25
> ("usb: typec: ucsi: glink: fix child node release in probe function")
> to account for a safer approach to iterating over child nodes.
> ---
>  drivers/usb/typec/ucsi/ucsi_glink.c | 9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/usb/typec/ucsi/ucsi_glink.c b/drivers/usb/typec/ucsi/ucsi_glink.c
> index 2fa973afe4e6..d41c9caa84e0 100644
> --- a/drivers/usb/typec/ucsi/ucsi_glink.c
> +++ b/drivers/usb/typec/ucsi/ucsi_glink.c
> @@ -333,7 +333,6 @@ static int pmic_glink_ucsi_probe(struct auxiliary_device *adev,
>  	struct pmic_glink_ucsi *ucsi;
>  	struct device *dev = &adev->dev;
>  	const struct of_device_id *match;
> -	struct fwnode_handle *fwnode;
>  	int ret;
>  
>  	ucsi = devm_kzalloc(dev, sizeof(*ucsi), GFP_KERNEL);
> @@ -365,14 +364,13 @@ static int pmic_glink_ucsi_probe(struct auxiliary_device *adev,
>  
>  	ucsi_set_drvdata(ucsi->ucsi, ucsi);
>  
> -	device_for_each_child_node(dev, fwnode) {
> +	device_for_each_child_node_scoped(dev, fwnode) {
>  		struct gpio_desc *desc;
>  		u32 port;
>  
>  		ret = fwnode_property_read_u32(fwnode, "reg", &port);
>  		if (ret < 0) {
>  			dev_err(dev, "missing reg property of %pOFn\n", fwnode);
> -			fwnode_handle_put(fwnode);
>  			return ret;
>  		}
>  
> @@ -387,11 +385,10 @@ static int pmic_glink_ucsi_probe(struct auxiliary_device *adev,
>  		if (!desc)
>  			continue;
>  
> -		if (IS_ERR(desc)) {
> -			fwnode_handle_put(fwnode);
> +		if (IS_ERR(desc))
>  			return dev_err_probe(dev, PTR_ERR(desc),
>  					     "unable to acquire orientation gpio\n");
> -		}
> +
>  		ucsi->port_orientation[port] = desc;
>  	}
>  
> 
> ---
> base-commit: f76698bd9a8ca01d3581236082d786e9a6b72bb7
> change-id: 20240623-ucsi_glink-scoped-2d417fc9afd3
> 
> Best regards,
> -- 
> Javier Carrasco <javier.carrasco.cruz@...il.com>

-- 
heikki