linux-kernel - Re: [Outreachy kernel] [PATCH] staging: rtl8723bs: Remove unused variable ret

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Message-ID: <alpine.DEB.2.20.1709141807561.3185@hadrien>
Date:   Thu, 14 Sep 2017 18:09:43 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Harsha Sharma <harshasharmaiitr@...il.com>
cc:     gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, outreachy-kernel@...glegroups.com
Subject: Re: [Outreachy kernel] [PATCH] staging: rtl8723bs: Remove unused
 variable ret



On Thu, 14 Sep 2017, Harsha Sharma wrote:

> Remove unused variable ret as it is not used anywhere.
> Remove multiple blank lines.
> Done using following coccinelle semantic patch
>
> @@
> type T;
> identifier i;
> constant C;
> @@
>
> (
> extern T i;
> |
> - T i;
>   <+... when != i
> - i = C;
>   ...+>
> )
>
> Signed-off-by: Harsha Sharma <harshasharmaiitr@...il.com>
> ---
>  drivers/staging/rtl8723bs/os_dep/ioctl_linux.c | 6 ------
>  1 file changed, 6 deletions(-)
>
> diff --git a/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c b/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
> index ffbb35a..7935dc5 100644
> --- a/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
> +++ b/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
> @@ -2337,10 +2337,6 @@ static int rtw_wx_read32(struct net_device *dev,
>  	u32 data32;
>  	u32 bytes;
>  	u8 *ptmp;
> -	int ret;
> -
> -
> -	ret = 0;
>  	padapter = (struct adapter *)rtw_netdev_priv(dev);
>  	p = &wrqu->data;
>  	len = p->length;
> @@ -2352,7 +2348,6 @@ static int rtw_wx_read32(struct net_device *dev,
>  		return -ENOMEM;
>
>  	if (copy_from_user(ptmp, p->pointer, len)) {
> -		ret = -EFAULT;
>  		goto exit;
>  	}
>
> @@ -2375,7 +2370,6 @@ static int rtw_wx_read32(struct net_device *dev,
>  			break;
>  		default:
>  			DBG_871X(KERN_INFO "%s: usage> read [bytes],[address(hex)]\n", __func__);
> -			ret = -EINVAL;
>  			goto exit;

One could have the impression that the function should instead return ret.
One would have to figure out where the function is called from and what
happens there to the return value.

julia

>  	}
>  	DBG_871X(KERN_INFO "%s: addr = 0x%08X data =%s\n", __func__, addr, extra);
> --
> 1.9.1
>
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