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[79.52.107.152]) by smtp.gmail.com with ESMTPSA id zb2sm7847075ejb.52.2021.05.24.04.15.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 May 2021 04:15:05 -0700 (PDT) From: "Fabio M. De Francesco" To: Dan Carpenter , linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , linux-staging@lists.linux.dev Subject: Re: [PATCH] staging: rtl8723bs: core: rtw_mlme_ext.c: Remove set but unused variable Date: Mon, 24 May 2021 13:15:03 +0200 Message-ID: <2101445.5PPBstrGkB@linux.local> In-Reply-To: <20210524092552.GO1955@kadam> References: <20210523173042.19785-1-fmdefrancesco@gmail.com> <20210524092552.GO1955@kadam> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Monday, May 24, 2021 11:25:52 AM CEST Dan Carpenter wrote: > 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 > > --- > > > > 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. > It seems that I misinterpreted the semantics of get_unaligned_le16(). If I'm not still wrong the above function uses the __swab16 macro, which returns swapped bytes with _no_ side effects on the swapped variable. I'm about to send a patch v2 with the deletion suggested by you. Thanks, Fabio > > regards, > dan carpenter