Re: [PATCH v2 08/20] pinctrl: st: Use scope based of_node_put() cleanups

[Patrice CHOTARD]

On 5/4/24 15:20, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@xxxxxxx>
> 
> Use scope based of_node_put() cleanup to simplify code.
> 
> Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
> ---
>  drivers/pinctrl/pinctrl-st.c | 37 +++++++++++--------------------------
>  1 file changed, 11 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-st.c b/drivers/pinctrl/pinctrl-st.c
> index 5d9abd6547d0..fe2d52e434db 100644
> --- a/drivers/pinctrl/pinctrl-st.c
> +++ b/drivers/pinctrl/pinctrl-st.c
> @@ -1195,10 +1195,10 @@ static int st_pctl_dt_parse_groups(struct device_node *np,
>  	struct property *pp;
>  	struct device *dev = info->dev;
>  	struct st_pinconf *conf;
> -	struct device_node *pins;
> +	struct device_node *pins __free(device_node) = NULL;
>  	phandle bank;
>  	unsigned int offset;
> -	int i = 0, npins = 0, nr_props, ret = 0;
> +	int i = 0, npins = 0, nr_props;
>  
>  	pins = of_get_child_by_name(np, "st,pins");
>  	if (!pins)
> @@ -1213,8 +1213,7 @@ static int st_pctl_dt_parse_groups(struct device_node *np,
>  			npins++;
>  		} else {
>  			pr_warn("Invalid st,pins in %pOFn node\n", np);
> -			ret = -EINVAL;
> -			goto out_put_node;
> +			return -EINVAL;
>  		}
>  	}
>  
> @@ -1223,10 +1222,8 @@ static int st_pctl_dt_parse_groups(struct device_node *np,
>  	grp->pins = devm_kcalloc(dev, npins, sizeof(*grp->pins), GFP_KERNEL);
>  	grp->pin_conf = devm_kcalloc(dev, npins, sizeof(*grp->pin_conf), GFP_KERNEL);
>  
> -	if (!grp->pins || !grp->pin_conf) {
> -		ret = -ENOMEM;
> -		goto out_put_node;
> -	}
> +	if (!grp->pins || !grp->pin_conf)
> +		return -ENOMEM;
>  
>  	/* <bank offset mux direction rt_type rt_delay rt_clk> */
>  	for_each_property_of_node(pins, pp) {
> @@ -1260,17 +1257,13 @@ static int st_pctl_dt_parse_groups(struct device_node *np,
>  		i++;
>  	}
>  
> -out_put_node:
> -	of_node_put(pins);
> -
> -	return ret;
> +	return 0;
>  }
>  
>  static int st_pctl_parse_functions(struct device_node *np,
>  			struct st_pinctrl *info, u32 index, int *grp_index)
>  {
>  	struct device *dev = info->dev;
> -	struct device_node *child;
>  	struct st_pmx_func *func;
>  	struct st_pctl_group *grp;
>  	int ret, i;
> @@ -1285,15 +1278,13 @@ static int st_pctl_parse_functions(struct device_node *np,
>  		return -ENOMEM;
>  
>  	i = 0;
> -	for_each_child_of_node(np, child) {
> +	for_each_child_of_node_scoped(np, child) {
>  		func->groups[i] = child->name;
>  		grp = &info->groups[*grp_index];
>  		*grp_index += 1;
>  		ret = st_pctl_dt_parse_groups(child, grp, info, i++);
> -		if (ret) {
> -			of_node_put(child);
> +		if (ret)
>  			return ret;
> -		}
>  	}
>  	dev_info(dev, "Function[%d\t name:%s,\tgroups:%d]\n", index, func->name, func->ngroups);
>  
> @@ -1601,7 +1592,6 @@ static int st_pctl_probe_dt(struct platform_device *pdev,
>  	int i = 0, j = 0, k = 0, bank;
>  	struct pinctrl_pin_desc *pdesc;
>  	struct device_node *np = dev->of_node;
> -	struct device_node *child;
>  	int grp_index = 0;
>  	int irq = 0;
>  
> @@ -1646,25 +1636,21 @@ static int st_pctl_probe_dt(struct platform_device *pdev,
>  	pctl_desc->pins = pdesc;
>  
>  	bank = 0;
> -	for_each_child_of_node(np, child) {
> +	for_each_child_of_node_scoped(np, child) {
>  		if (of_property_read_bool(child, "gpio-controller")) {
>  			const char *bank_name = NULL;
>  			char **pin_names;
>  
>  			ret = st_gpiolib_register_bank(info, bank, child);
> -			if (ret) {
> -				of_node_put(child);
> +			if (ret)
>  				return ret;
> -			}
>  
>  			k = info->banks[bank].range.pin_base;
>  			bank_name = info->banks[bank].range.name;
>  
>  			pin_names = devm_kasprintf_strarray(dev, bank_name, ST_GPIO_PINS_PER_BANK);
> -			if (IS_ERR(pin_names)) {
> -				of_node_put(child);
> +			if (IS_ERR(pin_names))
>  				return PTR_ERR(pin_names);
> -			}
>  
>  			for (j = 0; j < ST_GPIO_PINS_PER_BANK; j++, k++) {
>  				pdesc->number = k;
> @@ -1678,7 +1664,6 @@ static int st_pctl_probe_dt(struct platform_device *pdev,
>  							i++, &grp_index);
>  			if (ret) {
>  				dev_err(dev, "No functions found.\n");
> -				of_node_put(child);
>  				return ret;
>  			}
>  		}
> 

Reviewed-by: Patrice Chotard <patrice.chotard@xxxxxxxxxxx>

Thanks
Patrice