ath9k: move RX check code into helper ath9k_rx_accept()

This does sanity checking on the skb and RX status descriptor
prior to processing.
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

@@ -86,28 +86,19 @@ static void ath_setdefantenna(struct ath_softc *sc, u32 antenna)
 	sc->rx.rxotherant = 0;
 }
 
-/*
- * For Decrypt or Demic errors, we only mark packet status here and always push
- * up the frame up to let mac80211 handle the actual error case, be it no
- * decryption key or real decryption error. This let us keep statistics there.
- */
-static int ath_rx_prepare(struct ath_common *common,
-			  struct ieee80211_hw *hw,
-			  struct sk_buff *skb, struct ath_rx_status *rx_stats,
-			  struct ieee80211_rx_status *rx_status,
+/* Assumes you've already done the endian to CPU conversion */
+static bool ath9k_rx_accept(struct ath_common *common,
+			    struct sk_buff *skb,
+			    struct ieee80211_rx_status *rxs,
+			    struct ath_rx_status *rx_stats,
 			    bool *decrypt_error)
 {
 	struct ath_hw *ah = common->ah;
 	struct ieee80211_hdr *hdr;
-	u8 ratecode;
 	__le16 fc;
-	struct ieee80211_sta *sta;
-	struct ath_node *an;
-	int last_rssi = ATH_RSSI_DUMMY_MARKER;
 
-	hdr = (struct ieee80211_hdr *)skb->data;
+	hdr = (struct ieee80211_hdr *) skb->data;
 	fc = hdr->frame_control;
-	memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
 
 	if (rx_stats->rs_more) {
 		/*
@@ -117,12 +108,12 @@ static int ath_rx_prepare(struct ath_common *common,
 		 * error frames in Monitor mode.
 		 */
 		if (ah->opmode != NL80211_IFTYPE_MONITOR)
-			goto rx_next;
+			return false;
 	} else if (rx_stats->rs_status != 0) {
 		if (rx_stats->rs_status & ATH9K_RXERR_CRC)
-			rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
+			rxs->flag |= RX_FLAG_FAILED_FCS_CRC;
 		if (rx_stats->rs_status & ATH9K_RXERR_PHY)
-			goto rx_next;
+			return false;
 
 		if (rx_stats->rs_status & ATH9K_RXERR_DECRYPT) {
 			*decrypt_error = true;
@@ -135,7 +126,7 @@ static int ath_rx_prepare(struct ath_common *common,
 				 */
 				rx_stats->rs_status &= ~ATH9K_RXERR_MIC;
 			else
-				rx_status->flag |= RX_FLAG_MMIC_ERROR;
+				rxs->flag |= RX_FLAG_MMIC_ERROR;
 		}
 		/*
 		 * Reject error frames with the exception of
@@ -146,14 +137,42 @@ static int ath_rx_prepare(struct ath_common *common,
 			if (rx_stats->rs_status &
 			    ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
 			      ATH9K_RXERR_CRC))
-				goto rx_next;
+				return false;
 		} else {
 			if (rx_stats->rs_status &
 			    ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) {
-				goto rx_next;
+				return false;
 			}
 		}
 	}
+	return true;
+}
+
+/*
+ * For Decrypt or Demic errors, we only mark packet status here and always push
+ * up the frame up to let mac80211 handle the actual error case, be it no
+ * decryption key or real decryption error. This let us keep statistics there.
+ */
+static int ath_rx_prepare(struct ath_common *common,
+			  struct ieee80211_hw *hw,
+			  struct sk_buff *skb, struct ath_rx_status *rx_stats,
+			  struct ieee80211_rx_status *rx_status,
+			  bool *decrypt_error)
+{
+	struct ath_hw *ah = common->ah;
+	struct ieee80211_hdr *hdr;
+	u8 ratecode;
+	__le16 fc;
+	struct ieee80211_sta *sta;
+	struct ath_node *an;
+	int last_rssi = ATH_RSSI_DUMMY_MARKER;
+
+	hdr = (struct ieee80211_hdr *)skb->data;
+	fc = hdr->frame_control;
+	memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
+
+	if (!ath9k_rx_accept(common, skb, rx_status, rx_stats, decrypt_error))
+		goto rx_next;
 
 	ratecode = rx_stats->rs_rate;