staging: vt6656: s_uCalculateLinkQual use netstats rx values

Use netstats rx_packets and rx_frame_errors.

Add frame errors to RXbBulkInProcessData

The current scStatistic.RxFcsErrCnt only records
USB errors not frame errors.

The scStatistic.RxOkCnt only recorded successful USB
transfers not actual successfully received packets.

So a more accurate reading is to use netstats rx_packets and
rx_frame_errors.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6656/bssdb.c

@@ -1393,13 +1393,12 @@ static void s_uCalculateLinkQual(struct vnt_private *pDevice)
 
 	TxCnt = stats->tx_packets + pDevice->wstats.discard.retries;
 
-	RxCnt = pDevice->scStatistic.RxFcsErrCnt +
-	      pDevice->scStatistic.RxOkCnt;
+	RxCnt = stats->rx_packets + stats->rx_frame_errors;
 
 	TxOkRatio = (TxCnt < 6) ? 4000:((stats->tx_packets * 4000) / TxCnt);
 
 	RxOkRatio = (RxCnt < 6) ? 2000 :
-				((pDevice->scStatistic.RxOkCnt * 2000) / RxCnt);
+				((stats->rx_packets * 2000) / RxCnt);
 
 	/* decide link quality */
 	if (pDevice->bLinkPass != true) {

drivers/staging/vt6656/dpc.c

@@ -291,12 +291,14 @@ int RXbBulkInProcessData(struct vnt_private *pDevice, struct vnt_rcb *pRCB,
 
 	if (BytesToIndicate != FrameSize) {
 		DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"------- WRONG Length 1\n");
+		pStats->rx_frame_errors++;
 		return false;
 	}
 
     if ((BytesToIndicate > 2372) || (BytesToIndicate <= 40)) {
         // Frame Size error drop this packet.
 	DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "---------- WRONG Length 2\n");
+	pStats->rx_frame_errors++;
         return false;
     }
 
@@ -314,6 +316,7 @@ int RXbBulkInProcessData(struct vnt_private *pDevice, struct vnt_rcb *pRCB,
          (BytesToIndicate < (*pwPLCP_Length)) ) {
 
         DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"Wrong PLCP Length %x\n", (int) *pwPLCP_Length);
+	pStats->rx_frame_errors++;
         return false;
     }
     for ( ii=RATE_1M;ii<MAX_RATE;ii++) {