linux-kernel - Re: [PATCH v1 08/14] extcon: Switch to use kasprintf

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Date:   Mon, 3 Apr 2023 23:58:41 +0900
From:   Chanwoo Choi <cwchoi00@...il.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Bumwoo Lee <bw365.lee@...sung.com>,
        linux-kernel@...r.kernel.org
Cc:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>
Subject: Re: [PATCH v1 08/14] extcon: Switch to use kasprintf_strarray()

On 23. 3. 22. 23:39, Andy Shevchenko wrote:
> Since we have a generic helper, switch the module to use it.
> No functional change intended.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/extcon/extcon.c | 25 +++++++++++--------------
>  drivers/extcon/extcon.h |  1 +
>  2 files changed, 12 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
> index 0d261ec6c473..a63e7eef02fd 100644
> --- a/drivers/extcon/extcon.c
> +++ b/drivers/extcon/extcon.c
> @@ -23,6 +23,7 @@
>  #include <linux/err.h>
>  #include <linux/of.h>
>  #include <linux/slab.h>
> +#include <linux/string_helpers.h>
>  #include <linux/sysfs.h>
>  
>  #include "extcon.h"
> @@ -1104,19 +1105,17 @@ static int extcon_alloc_cables(struct extcon_dev *edev)
>  	if (!edev->cables)
>  		return -ENOMEM;
>  
> +	edev->cable_names = kasprintf_strarray(GFP_KERNEL, "cable", edev->max_supported);
> +	if (!edev->cable_names) {
> +		kfree(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;
> -		}
> +		str = edev->cable_names[index];
> +		strreplace(str, '-', '.');
>  
>  		cable->edev = edev;
>  		cable->cable_index = index;
> @@ -1341,8 +1340,7 @@ int extcon_dev_register(struct extcon_dev *edev)
>  		kfree(edev->attrs_muex);
>  	}
>  err_alloc_muex:
> -	for (index = 0; index < edev->max_supported; index++)
> -		kfree(edev->cables[index].attr_g.name);
> +	kfree_strarray(edev->cable_names, edev->max_supported);
>  	if (edev->max_supported)
>  		kfree(edev->cables);
>  err_alloc_cables:
> @@ -1387,8 +1385,7 @@ void extcon_dev_unregister(struct extcon_dev *edev)
>  		kfree(edev->attrs_muex);
>  	}
>  
> -	for (index = 0; index < edev->max_supported; index++)
> -		kfree(edev->cables[index].attr_g.name);
> +	kfree_strarray(edev->cable_names, edev->max_supported);
>  
>  	if (edev->max_supported) {
>  		kfree(edev->extcon_dev_type.groups);
> diff --git a/drivers/extcon/extcon.h b/drivers/extcon/extcon.h
> index 877c0860e300..5624f65ba17a 100644
> --- a/drivers/extcon/extcon.h
> +++ b/drivers/extcon/extcon.h
> @@ -58,6 +58,7 @@ struct extcon_dev {
>  	/* /sys/class/extcon/.../cable.n/... */
>  	struct device_type extcon_dev_type;
>  	struct extcon_cable *cables;
> +	char **cable_names;

The extcon cable information should be included in struct extcon_cable
in order to gather information into one point like encapsulation.

I don't prefer to add 'cable_names'.

>  
>  	/* /sys/class/extcon/.../mutually_exclusive/... */
>  	struct attribute_group attr_g_muex;

-- 
Best Regards,
Samsung Electronics
Chanwoo Choi