staging: r8188eu: xmit_priv's vcs is not used

The vcs component in struct xmit_priv is set but not used. We can remove
vcs and the rtw_update_protection function, whose only job is to set vcs.
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Acked-by: Pavel Skripkin <paskripkin@gmail.com>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Link: https://lore.kernel.org/r/20230109212852.75612-12-martin@kaiser.cxSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_mlme.c

@@ -444,8 +444,6 @@ static void update_current_network(struct adapter *adapter, struct wlan_bssid_ex
 	if (check_fwstate(pmlmepriv, _FW_LINKED) &&
 	    is_same_network(&pmlmepriv->cur_network.network, pnetwork)) {
 		update_network(&pmlmepriv->cur_network.network, pnetwork, adapter, true);
-		rtw_update_protection(adapter, (pmlmepriv->cur_network.network.IEs) + sizeof(struct ndis_802_11_fixed_ie),
-				      pmlmepriv->cur_network.network.IELength);
 	}
 
 }
@@ -1027,9 +1025,6 @@ static void rtw_joinbss_update_network(struct adapter *padapter, struct wlan_net
 		break;
 	}
 
-	rtw_update_protection(padapter, (cur_network->network.IEs) +
-			      sizeof(struct ndis_802_11_fixed_ie),
-			      (cur_network->network.IELength));
 	rtw_update_ht_cap(padapter, cur_network->network.IEs, cur_network->network.IELength);
 }
 

drivers/staging/r8188eu/core/rtw_xmit.c

@@ -1099,40 +1099,6 @@ s32 rtw_put_snap(u8 *data, u16 h_proto)
 	return SNAP_SIZE + sizeof(u16);
 }
 
-void rtw_update_protection(struct adapter *padapter, u8 *ie, uint ie_len)
-{
-	uint	protection;
-	u8	*perp;
-	int	 erp_len;
-	struct	xmit_priv *pxmitpriv = &padapter->xmitpriv;
-	struct	registry_priv *pregistrypriv = &padapter->registrypriv;
-
-	switch (pxmitpriv->vcs_setting) {
-	case DISABLE_VCS:
-		pxmitpriv->vcs = NONE_VCS;
-		break;
-	case ENABLE_VCS:
-		break;
-	case AUTO_VCS:
-	default:
-		perp = rtw_get_ie(ie, _ERPINFO_IE_, &erp_len, ie_len);
-		if (!perp) {
-			pxmitpriv->vcs = NONE_VCS;
-		} else {
-			protection = (*(perp + 2)) & BIT(1);
-			if (protection) {
-				if (pregistrypriv->vcs_type == RTS_CTS)
-					pxmitpriv->vcs = RTS_CTS;
-				else
-					pxmitpriv->vcs = CTS_TO_SELF;
-			} else {
-				pxmitpriv->vcs = NONE_VCS;
-			}
-		}
-		break;
-	}
-}
-
 void rtw_count_tx_stats(struct adapter *padapter, struct xmit_frame *pxmitframe, int sz)
 {
 	struct sta_info *psta = NULL;

drivers/staging/r8188eu/include/rtw_xmit.h

@@ -268,7 +268,6 @@ struct	xmit_priv {
 	uint	frag_len;
 	struct adapter	*adapter;
 	u8   vcs_setting;
-	u8	vcs;
 	u64	tx_bytes;
 	u64	tx_pkts;
 	u64	tx_drop;
@@ -312,7 +311,6 @@ s32 rtw_free_xmitbuf(struct xmit_priv *pxmitpriv,
 		     struct xmit_buf *pxmitbuf);
 void rtw_count_tx_stats(struct adapter *padapter,
 			struct xmit_frame *pxmitframe, int sz);
-void rtw_update_protection(struct adapter *padapter, u8 *ie, uint ie_len);
 s32 rtw_make_wlanhdr(struct adapter *padapter, u8 *hdr,
 		     struct pkt_attrib *pattrib);
 s32 rtw_put_snap(u8 *data, u16 h_proto);

drivers/staging/r8188eu/os_dep/os_intfs.c

@@ -393,7 +393,6 @@ static void rtw_init_default_value(struct adapter *padapter)
 
 	/* xmit_priv */
 	pxmitpriv->vcs_setting = pregistrypriv->vrtl_carrier_sense;
-	pxmitpriv->vcs = pregistrypriv->vcs_type;
 	pxmitpriv->frag_len = pregistrypriv->frag_thresh;
 
 	/* mlme_priv */