From 846d9363505d14e591a427619ccb7ffe6a7a3541 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Sat, 8 Oct 2011 22:02:58 +0200 Subject: ath9k_hw: fix a regression in key miss handling The commit "ath9k_hw: Fix incorrect key_miss handling" changed the code to only report key miss errors if a MIC error wasn't reported. When checking the flags in that order in the MAC code, it might miss some real events, because the value of the MIC error flag is undefined under some conditions. The primary issue addressed by the previous commit is making sure that MIC errors are properly reported on the STA side. This can be fixed in a better way by adding a separate rx status flag for key miss and ignoring it for multicast frames. This fix slightly improves stability in AP mode on some older hardware, like AR9132. Signed-off-by: Felix Fietkau Cc: stable@kernel.org Signed-off-by: John W. Linville --- drivers/net/wireless/ath/ath9k/recv.c | 27 ++++++++++++++------------- 1 file changed, 14 insertions(+), 13 deletions(-) (limited to 'drivers/net/wireless/ath/ath9k/recv.c') diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c index 33d30792d7d..cd2722529c1 100644 --- a/drivers/net/wireless/ath/ath9k/recv.c +++ b/drivers/net/wireless/ath/ath9k/recv.c @@ -820,7 +820,8 @@ static bool ath9k_rx_accept(struct ath_common *common, test_bit(rx_stats->rs_keyix, common->tkip_keymap); strip_mic = is_valid_tkip && ieee80211_is_data(fc) && !(rx_stats->rs_status & - (ATH9K_RXERR_DECRYPT | ATH9K_RXERR_CRC | ATH9K_RXERR_MIC)); + (ATH9K_RXERR_DECRYPT | ATH9K_RXERR_CRC | ATH9K_RXERR_MIC | + ATH9K_RXERR_KEYMISS)); if (!rx_stats->rs_datalen) return false; @@ -848,6 +849,8 @@ static bool ath9k_rx_accept(struct ath_common *common, * descriptors. */ if (rx_stats->rs_status != 0) { + u8 status_mask; + if (rx_stats->rs_status & ATH9K_RXERR_CRC) { rxs->flag |= RX_FLAG_FAILED_FCS_CRC; mic_error = false; @@ -855,7 +858,8 @@ static bool ath9k_rx_accept(struct ath_common *common, if (rx_stats->rs_status & ATH9K_RXERR_PHY) return false; - if (rx_stats->rs_status & ATH9K_RXERR_DECRYPT) { + if ((rx_stats->rs_status & ATH9K_RXERR_DECRYPT) || + (!is_mc && (rx_stats->rs_status & ATH9K_RXERR_KEYMISS))) { *decrypt_error = true; mic_error = false; } @@ -865,17 +869,14 @@ static bool ath9k_rx_accept(struct ath_common *common, * decryption and MIC failures. For monitor mode, * we also ignore the CRC error. */ - if (ah->is_monitoring) { - if (rx_stats->rs_status & - ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC | - ATH9K_RXERR_CRC)) - return false; - } else { - if (rx_stats->rs_status & - ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) { - return false; - } - } + status_mask = ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC | + ATH9K_RXERR_KEYMISS; + + if (ah->is_monitoring) + status_mask |= ATH9K_RXERR_CRC; + + if (rx_stats->rs_status & ~status_mask) + return false; } /* -- cgit v1.2.3-70-g09d2