ath9k_htc: Fix TKIP encryption

Set IEEE80211_HW_RX_INCLUDES_FCS to indicate that
the FCS is present in RX frames. Also, remove a redundant
assignment of skb length and include the FCS_LEN
when checking padding.

Fixing this issue makes TKIP work.
Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/htc_drv_init.c

@@ -513,7 +513,8 @@ static void ath9k_set_hw_capab(struct ath9k_htc_priv *priv,
 	hw->flags = IEEE80211_HW_SIGNAL_DBM |
 		IEEE80211_HW_AMPDU_AGGREGATION |
 		IEEE80211_HW_SPECTRUM_MGMT |
-		IEEE80211_HW_HAS_RATE_CONTROL;
+		IEEE80211_HW_HAS_RATE_CONTROL |
+		IEEE80211_HW_RX_INCLUDES_FCS;
 
 	hw->wiphy->interface_modes =
 		BIT(NL80211_IFTYPE_STATION) |

drivers/net/wireless/ath/ath9k/htc_drv_txrx.c

@@ -450,7 +450,7 @@ static bool ath9k_rx_prepare(struct ath9k_htc_priv *priv,
 	padpos = ath9k_cmn_padpos(fc);
 
 	padsize = padpos & 3;
-	if (padsize && skb->len >= padpos+padsize) {
+	if (padsize && skb->len >= padpos+padsize+FCS_LEN) {
 		memmove(skb->data + padsize, skb->data, padpos);
 		skb_pull(skb, padsize);
 	}
@@ -646,7 +646,6 @@ void ath9k_htc_rxep(void *drv_priv, struct sk_buff *skb,
 	spin_lock(&priv->rx.rxbuflock);
 	memcpy(&rxbuf->rxstatus, rxstatus, HTC_RX_FRAME_HEADER_SIZE);
 	skb_pull(skb, HTC_RX_FRAME_HEADER_SIZE);
-	skb->len = rxstatus->rs_datalen;
 	rxbuf->skb = skb;
 	rxbuf->in_process = true;
 	spin_unlock(&priv->rx.rxbuflock);