linux-kernel - Re: [PATCH v4 2/4] extcon: Added extcon_alloc_cables to simplify extcon register function

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Date:   Mon, 13 Mar 2023 20:06:11 +0900
From:   Chanwoo Choi <cwchoi00@...il.com>
To:     Bumwoo Lee <bw365.lee@...sung.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/4] extcon: Added extcon_alloc_cables to simplify
 extcon register function

On 23. 3. 2. 18:01, Bumwoo Lee wrote:
> The cable allocation part is functionalized from extcon_dev_register.
> 
> Signed-off-by: Bumwoo Lee <bw365.lee@...sung.com>
> ---
>  drivers/extcon/extcon.c | 108 +++++++++++++++++++++++-----------------
>  1 file changed, 62 insertions(+), 46 deletions(-)
> 
> diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
> index adcf01132f70..49605e96bedd 100644
> --- a/drivers/extcon/extcon.c
> +++ b/drivers/extcon/extcon.c
> @@ -1070,6 +1070,63 @@ void extcon_dev_free(struct extcon_dev *edev)
>  }
>  EXPORT_SYMBOL_GPL(extcon_dev_free);
>  
> +/**
> + * extcon_alloc_cables() - alloc the cables for extcon device
> + * @edev:	extcon device which has cables
> + *
> + * Returns 0 if success or error number if fail.
> + */
> +static int extcon_alloc_cables(struct extcon_dev *edev)
> +{
> +	int index;
> +	char *str;
> +	struct extcon_cable *cable;
> +
> +	if (!edev->max_supported)
> +		return 0;


Need to check whether edev is NULL or not 
because make the separate function.

	if (!edev && !edev->max_supported)

> +
> +	edev->cables = kcalloc(edev->max_supported,
> +			       sizeof(struct extcon_cable),
> +			       GFP_KERNEL);
> +	if (!edev->cables)
> +		return -ENOMEM;
> +
> +	for (index = 0; index < edev->max_supported; index++) {
> +		cable = &edev->cables[index];
> +
> +		str = kasprintf(GFP_KERNEL, "cable.%d", index);
> +		if (!str) {
> +			for (index--; index >= 0; index--) {
> +				cable = &edev->cables[index];
> +				kfree(cable->attr_g.name);
> +			}
> +
> +			kfree(edev->cables);
> +			return -ENOMEM;
> +		}
> +
> +		cable->edev = edev;
> +		cable->cable_index = index;
> +		cable->attrs[0] = &cable->attr_name.attr;
> +		cable->attrs[1] = &cable->attr_state.attr;
> +		cable->attrs[2] = NULL;
> +		cable->attr_g.name = str;
> +		cable->attr_g.attrs = cable->attrs;
> +
> +		sysfs_attr_init(&cable->attr_name.attr);
> +		cable->attr_name.attr.name = "name";
> +		cable->attr_name.attr.mode = 0444;
> +		cable->attr_name.show = cable_name_show;
> +
> +		sysfs_attr_init(&cable->attr_state.attr);
> +		cable->attr_state.attr.name = "state";
> +		cable->attr_state.attr.mode = 0444;
> +		cable->attr_state.show = cable_state_show;
> +	}
> +
> +	return 0;
> +}
> +
>  /**
>   * extcon_dev_register() - Register an new extcon device
>   * @edev:	the extcon device to be registered
> @@ -1117,50 +1174,9 @@ int extcon_dev_register(struct extcon_dev *edev)
>  	dev_set_name(&edev->dev, "extcon%lu",
>  			(unsigned long)atomic_inc_return(&edev_no));
>  
> -	if (edev->max_supported) {
> -		char *str;
> -		struct extcon_cable *cable;
> -
> -		edev->cables = kcalloc(edev->max_supported,
> -				       sizeof(struct extcon_cable),
> -				       GFP_KERNEL);
> -		if (!edev->cables) {
> -			ret = -ENOMEM;
> -			goto err_sysfs_alloc;
> -		}
> -		for (index = 0; index < edev->max_supported; index++) {
> -			cable = &edev->cables[index];
> -
> -			str = kasprintf(GFP_KERNEL, "cable.%d", index);
> -			if (!str) {
> -				for (index--; index >= 0; index--) {
> -					cable = &edev->cables[index];
> -					kfree(cable->attr_g.name);
> -				}
> -				ret = -ENOMEM;
> -
> -				goto err_alloc_cables;
> -			}
> -
> -			cable->edev = edev;
> -			cable->cable_index = index;
> -			cable->attrs[0] = &cable->attr_name.attr;
> -			cable->attrs[1] = &cable->attr_state.attr;
> -			cable->attrs[2] = NULL;
> -			cable->attr_g.name = str;
> -			cable->attr_g.attrs = cable->attrs;
> -
> -			sysfs_attr_init(&cable->attr_name.attr);
> -			cable->attr_name.attr.name = "name";
> -			cable->attr_name.attr.mode = 0444;
> -			cable->attr_name.show = cable_name_show;
> -
> -			sysfs_attr_init(&cable->attr_state.attr);
> -			cable->attr_state.attr.name = "state";
> -			cable->attr_state.attr.mode = 0444;
> -			cable->attr_state.show = cable_state_show;
> -		}
> -	}
> +	ret = extcon_alloc_cables(edev);
> +	if (ret < 0)
> +		goto err_alloc_cables;
>  
>  	if (edev->max_supported && edev->mutually_exclusive) {
>  		char *name;
> @@ -1279,10 +1295,10 @@ int extcon_dev_register(struct extcon_dev *edev)
>  err_muex:
>  	for (index = 0; index < edev->max_supported; index++)
>  		kfree(edev->cables[index].attr_g.name);
> -err_alloc_cables:
>  	if (edev->max_supported)
>  		kfree(edev->cables);
> -err_sysfs_alloc:
> +err_alloc_cables:
> +
>  	return ret;
>  }
>  EXPORT_SYMBOL_GPL(extcon_dev_register);

-- 
Best Regards,
Samsung Electronics
Chanwoo Choi