linux-kernel - Re: [PATCH v2] staging: rtl8723bs: os_dep: simplify the return statement.

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Date:   Sun, 10 Oct 2021 14:59:43 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Saurav Girepunje <saurav.girepunje@...il.com>
Cc:     fabioaiuto83@...il.com, ross.schm.dev@...il.com,
        marcocesati@...il.com, insafonov@...il.com,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        saurav.girepunje@...mail.com
Subject: Re: [PATCH v2] staging: rtl8723bs: os_dep: simplify the return
 statement.

On Sun, Oct 10, 2021 at 10:36:05AM +0530, Saurav Girepunje wrote:
> Remove the unneeded and redundant check of variable on goto out.
> Simplify the return using multiple goto label to avoid
> unneeded check.
> 
> Signed-off-by: Saurav Girepunje <saurav.girepunje@...il.com>
> ---
> 
> ChangeLog V2:
> 	-Add goto out after the memcpy for no error case return with
> 	 ret only. Free is not required on no error case.
> 
> ChangeLog V1:
> 	-Remove the unneeded and redundant check of variable on
> 	 goto out.
> 	-Simplify the return using multiple goto label to avoid
> 	 unneeded check.
> 
>  .../staging/rtl8723bs/os_dep/ioctl_cfg80211.c | 22 +++++++++----------
>  1 file changed, 10 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c b/drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c
> index 0868f56e2979..ae9579dc0848 100644
> --- a/drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c
> +++ b/drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c
> @@ -2312,7 +2312,7 @@ static int rtw_cfg80211_add_monitor_if(struct adapter *padapter, char *name, str
>  	mon_wdev = rtw_zmalloc(sizeof(struct wireless_dev));
>  	if (!mon_wdev) {
>  		ret = -ENOMEM;
> -		goto out;
> +		goto err_zmalloc;
>  	}
> 
>  	mon_wdev->wiphy = padapter->rtw_wdev->wiphy;
> @@ -2322,23 +2322,21 @@ static int rtw_cfg80211_add_monitor_if(struct adapter *padapter, char *name, str
> 
>  	ret = cfg80211_register_netdevice(mon_ndev);
>  	if (ret) {
> -		goto out;
> +		goto err_register;
>  	}
> 
>  	*ndev = pwdev_priv->pmon_ndev = mon_ndev;
>  	memcpy(pwdev_priv->ifname_mon, name, IFNAMSIZ+1);
> +	goto out;
> 
> -out:
> -	if (ret && mon_wdev) {
> -		kfree(mon_wdev);
> -		mon_wdev = NULL;
> -	}
> -
> -	if (ret && mon_ndev) {
> -		free_netdev(mon_ndev);
> -		*ndev = mon_ndev = NULL;
> -	}
> +err_register:
> +	kfree(mon_wdev);
> +	mon_wdev = NULL;

There is no need to set a local variable like this to NULL.

thanks,

greg k-h