linux-kernel - Re: [PATCH] staging: rtl8723bs: core: rtw_mlme

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Date:   Mon, 24 May 2021 12:25:52 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: rtl8723bs: core: rtw_mlme_ext.c: Remove set but
 unused variable

On Sun, May 23, 2021 at 07:30:42PM +0200, Fabio M. De Francesco wrote:
> Removed set but unused 'reason_code' variable. Issue detected by GCC
> running with the warning option -Wunused-but-set-variable. Removed its
> use as a storage of the return value of get_unaligned_le16(), which has
> been left as is because it has side effects on the argument it takes.
> 
> Signed-off-by: Fabio M. De Francesco <fmdefrancesco@...il.com>
> ---
>  drivers/staging/rtl8723bs/core/rtw_mlme_ext.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c b/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c
> index 9fc612fb736f..a13b3ec42bc9 100644
> --- a/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c
> +++ b/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c
> @@ -1721,7 +1721,7 @@ unsigned int OnAction_back(struct adapter *padapter, union recv_frame *precv_fra
>  	struct recv_reorder_ctrl *preorder_ctrl;
>  	unsigned char 	*frame_body;
>  	unsigned char 	category, action;
> -	unsigned short	tid, status, reason_code = 0;
> +	unsigned short	tid, status;
>  	struct mlme_ext_priv *pmlmeext = &padapter->mlmeextpriv;
>  	struct mlme_ext_info *pmlmeinfo = &(pmlmeext->mlmext_info);
>  	u8 *pframe = precv_frame->u.hdr.rx_data;
> @@ -1791,8 +1791,7 @@ unsigned int OnAction_back(struct adapter *padapter, union recv_frame *precv_fra
>  				psta->htpriv.candidate_tid_bitmap &=
>  					~BIT((frame_body[3] >> 4) & 0xf);
>  
> -				/* reason_code = frame_body[4] | (frame_body[5] << 8); */
> -				reason_code = get_unaligned_le16(&frame_body[4]);
> +				get_unaligned_le16(&frame_body[4]);

It doesn't have any side effects.  Just delete it too.

regards,
dan carpenter