ath9k: fix a WEP crypto related regression

commit f88373fa47f3ce6590fdfaa742d0ddacc2ae017f upstream.

commit b4a82a0 "ath9k_hw: fix interpretation of the rx KeyMiss flag"
fixed the interpretation of the KeyMiss flag for keycache based lookups,
however WEP encryption uses a static index, so KeyMiss is always asserted
for it, even though frames are decrypted properly.
Fix this by clearing the ATH9K_RXERR_KEYMISS flag if no keycache based
lookup was performed.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Reported-by: Laurent Bonnans <bonnans.l@gmail.com>
Reported-by: Jurica Vukadin <u.ra604@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c
index 67b862c..2f3aeac 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -824,6 +824,14 @@ static bool ath9k_rx_accept(struct ath_common *common,
                (ATH9K_RXERR_DECRYPT | ATH9K_RXERR_CRC | ATH9K_RXERR_MIC |
                 ATH9K_RXERR_KEYMISS));
 
+       /*
+        * Key miss events are only relevant for pairwise keys where the
+        * descriptor does contain a valid key index. This has been observed
+        * mostly with CCMP encryption.
+        */
+       if (rx_stats->rs_keyix == ATH9K_RXKEYIX_INVALID)
+               rx_stats->rs_status &= ~ATH9K_RXERR_KEYMISS;
+
        if (!rx_stats->rs_datalen)
                return false;
         /*