linux-kernel - Re: [PATCH v4 3/4] extcon: Added extcon_alloc_muex to simplify extcon register function

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Date:   Mon, 13 Mar 2023 20:08:02 +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 3/4] extcon: Added extcon_alloc_muex to simplify extcon
 register function

On 23. 3. 2. 18:01, Bumwoo Lee wrote:
> The mutual exclusive part is functionalized from extcon_dev_register.
> 
> Signed-off-by: Bumwoo Lee <bw365.lee@...sung.com>
> ---
>  drivers/extcon/extcon.c | 106 ++++++++++++++++++++++------------------
>  1 file changed, 58 insertions(+), 48 deletions(-)
> 
> diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
> index 49605e96bedd..321988231806 100644
> --- a/drivers/extcon/extcon.c
> +++ b/drivers/extcon/extcon.c
> @@ -1127,6 +1127,60 @@ static int extcon_alloc_cables(struct extcon_dev *edev)
>  	return 0;
>  }
>  
> +/**
> + * extcon_alloc_muex() - alloc the mutual exclusive for extcon device
> + * @edev:	extcon device
> + *
> + * Returns 0 if success or error number if fail.
> + */
> +static int extcon_alloc_muex(struct extcon_dev *edev)
> +{
> +	char *name;
> +	int index;
> +

ditto.

	if (!edev)
		return -EINVAL;

> +	if (!(edev->max_supported && edev->mutually_exclusive))
> +		return 0;
> +
> +	/* Count the size of mutually_exclusive array */
> +	for (index = 0; edev->mutually_exclusive[index]; index++)
> +		;
> +
> +	edev->attrs_muex = kcalloc(index + 1,
> +				   sizeof(struct attribute *),
> +				   GFP_KERNEL);
> +	if (!edev->attrs_muex)
> +		return -ENOMEM;
> +
> +	edev->d_attrs_muex = kcalloc(index,
> +				     sizeof(struct device_attribute),
> +				     GFP_KERNEL);
> +	if (!edev->d_attrs_muex) {
> +		kfree(edev->attrs_muex);
> +		return -ENOMEM;
> +	}
> +
> +	for (index = 0; edev->mutually_exclusive[index]; index++) {
> +		name = kasprintf(GFP_KERNEL, "0x%x",
> +				 edev->mutually_exclusive[index]);
> +		if (!name) {
> +			for (index--; index >= 0; index--)
> +				kfree(edev->d_attrs_muex[index].attr.name);
> +
> +			kfree(edev->d_attrs_muex);
> +			kfree(edev->attrs_muex);
> +			return -ENOMEM;
> +		}
> +		sysfs_attr_init(&edev->d_attrs_muex[index].attr);
> +		edev->d_attrs_muex[index].attr.name = name;
> +		edev->d_attrs_muex[index].attr.mode = 0000;
> +		edev->attrs_muex[index] = &edev->d_attrs_muex[index].attr;
> +	}
> +	edev->attr_g_muex.name = muex_name;
> +	edev->attr_g_muex.attrs = edev->attrs_muex;
> +
> +	return 0;
> +}
> +
>  /**
>   * extcon_dev_register() - Register an new extcon device
>   * @edev:	the extcon device to be registered
> @@ -1178,53 +1232,9 @@ int extcon_dev_register(struct extcon_dev *edev)
>  	if (ret < 0)
>  		goto err_alloc_cables;
>  
> -	if (edev->max_supported && edev->mutually_exclusive) {
> -		char *name;
> -
> -		/* Count the size of mutually_exclusive array */
> -		for (index = 0; edev->mutually_exclusive[index]; index++)
> -			;
> -
> -		edev->attrs_muex = kcalloc(index + 1,
> -					   sizeof(struct attribute *),
> -					   GFP_KERNEL);
> -		if (!edev->attrs_muex) {
> -			ret = -ENOMEM;
> -			goto err_muex;
> -		}
> -
> -		edev->d_attrs_muex = kcalloc(index,
> -					     sizeof(struct device_attribute),
> -					     GFP_KERNEL);
> -		if (!edev->d_attrs_muex) {
> -			ret = -ENOMEM;
> -			kfree(edev->attrs_muex);
> -			goto err_muex;
> -		}
> -
> -		for (index = 0; edev->mutually_exclusive[index]; index++) {
> -			name = kasprintf(GFP_KERNEL, "0x%x",
> -					 edev->mutually_exclusive[index]);
> -			if (!name) {
> -				for (index--; index >= 0; index--) {
> -					kfree(edev->d_attrs_muex[index].attr.
> -					      name);
> -				}
> -				kfree(edev->d_attrs_muex);
> -				kfree(edev->attrs_muex);
> -				ret = -ENOMEM;
> -				goto err_muex;
> -			}
> -			sysfs_attr_init(&edev->d_attrs_muex[index].attr);
> -			edev->d_attrs_muex[index].attr.name = name;
> -			edev->d_attrs_muex[index].attr.mode = 0000;
> -			edev->attrs_muex[index] = &edev->d_attrs_muex[index]
> -							.attr;
> -		}
> -		edev->attr_g_muex.name = muex_name;
> -		edev->attr_g_muex.attrs = edev->attrs_muex;
> -
> -	}
> +	ret = extcon_alloc_muex(edev);
> +	if (ret < 0)
> +		goto err_alloc_muex;
>  
>  	if (edev->max_supported) {
>  		edev->extcon_dev_type.groups =
> @@ -1292,7 +1302,7 @@ int extcon_dev_register(struct extcon_dev *edev)
>  		kfree(edev->d_attrs_muex);
>  		kfree(edev->attrs_muex);
>  	}
> -err_muex:
> +err_alloc_muex:
>  	for (index = 0; index < edev->max_supported; index++)
>  		kfree(edev->cables[index].attr_g.name);
>  	if (edev->max_supported)

-- 
Best Regards,
Samsung Electronics
Chanwoo Choi