staging: rtl8723au: OnDeAuth23a() use ieee80211 header defines

Use the proper ieee80211.h structs to parse the response instead of
hard coded offsets.
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723au/core/rtw_mlme_ext.c

@@ -1702,19 +1702,18 @@ unsigned int OnAssocRsp23a(struct rtw_adapter *padapter,
 unsigned int OnDeAuth23a(struct rtw_adapter *padapter,
 			 struct recv_frame *precv_frame)
 {
-	unsigned short	reason;
+	unsigned short reason;
 	struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
-	struct mlme_ext_priv	*pmlmeext = &padapter->mlmeextpriv;
+	struct mlme_ext_priv *pmlmeext = &padapter->mlmeextpriv;
 	struct mlme_ext_info *pmlmeinfo = &pmlmeext->mlmext_info;
 	struct sk_buff *skb = precv_frame->pkt;
-	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
-	u8 *pframe = skb->data;
+	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) skb->data;
 
-	/* check A3 */
-	if (!ether_addr_equal(hdr->addr3, get_my_bssid23a(&pmlmeinfo->network)))
+	if (!ether_addr_equal(mgmt->bssid,
+			      get_my_bssid23a(&pmlmeinfo->network)))
 		return _SUCCESS;
 
-	reason = le16_to_cpu(*(unsigned short *)(pframe + sizeof(struct ieee80211_hdr_3addr)));
+	reason = le16_to_cpu(mgmt->u.deauth.reason_code);
 
 	DBG_8723A("%s Reason code(%d)\n", __func__, reason);
 
@@ -1724,9 +1723,9 @@ unsigned int OnDeAuth23a(struct rtw_adapter *padapter,
 		struct sta_priv *pstapriv = &padapter->stapriv;
 
 		DBG_8723A_LEVEL(_drv_always_, "ap recv deauth reason code(%d) "
-				"sta:%pM\n", reason, hdr->addr2);
+				"sta:%pM\n", reason, mgmt->sa);
 
-		psta = rtw_get_stainfo23a(pstapriv, hdr->addr2);
+		psta = rtw_get_stainfo23a(pstapriv, mgmt->sa);
 		if (psta) {
 			u8 updated = 0;
 
@@ -1743,16 +1742,16 @@ unsigned int OnDeAuth23a(struct rtw_adapter *padapter,
 		}
 
 		return _SUCCESS;
-	}
-	else
+	} else
 #endif
 	{
 		DBG_8723A_LEVEL(_drv_always_, "sta recv deauth reason code(%d) "
-				"sta:%pM\n", reason, hdr->addr3);
+				"sta:%pM\n", reason, mgmt->bssid);
 
-		receive_disconnect23a(padapter, hdr->addr3, reason);
+		receive_disconnect23a(padapter, mgmt->bssid, reason);
 	}
 	pmlmepriv->LinkDetectInfo.bBusyTraffic = false;
+
 	return _SUCCESS;
 }