ath5k: capture CCK and OFDM restarts

Treat frames that underwent a CCK or OFDM restart as frames with an invalid CRC.

Signed-off-by: Mathy Vanhoef <vanhoefm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath5k/base.c b/drivers/net/wireless/ath/ath5k/base.c
index 5839a34..8ad2550 100644 (file)
--- a/drivers/net/wireless/ath/ath5k/base.c
+++ b/drivers/net/wireless/ath/ath5k/base.c
@@ -1462,7 +1462,20 @@ ath5k_receive_frame_ok(struct ath5k_hw *ah, struct ath5k_rx_status *rs)
                        ah->stats.rxerr_phy++;
                        if (rs->rs_phyerr > 0 && rs->rs_phyerr < 32)
                                ah->stats.rxerr_phy_code[rs->rs_phyerr]++;
-                       return false;
+
+                       /*
+                        * Treat packets that underwent a CCK or OFDM reset as having a bad CRC.
+                        * These restarts happen when the radio resynchronizes to a stronger frame
+                        * while receiving a weaker frame. Here we receive the prefix of the weak
+                        * frame. Since these are incomplete packets, mark their CRC as invalid.
+                        */
+                       if (rs->rs_phyerr == AR5K_RX_PHY_ERROR_OFDM_RESTART ||
+                           rs->rs_phyerr == AR5K_RX_PHY_ERROR_CCK_RESTART) {
+                               rs->rs_status |= AR5K_RXERR_CRC;
+                               rs->rs_status &= ~AR5K_RXERR_PHY;
+                       } else {
+                               return false;
+                       }
                }
                if (rs->rs_status & AR5K_RXERR_DECRYPT) {
                        /*