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ath9k: correctly handle short radar pulses 

In commit 3c0efb745a ("ath9k: discard undersized packets")
the lower bound of RX packets was set to 10 (min ACK size) to
filter those that would otherwise be treated as invalid at
mac80211.

Alas, short radar pulses are reported as PHY_ERROR frames
with length set to 3. Therefore their detection stopped
working after that commit.

NOTE: ath9k drivers built thereafter will not pass DFS
certification.

This extends the criteria for short packets to explicitly
handle PHY_ERROR frames.

Fixes: 3c0efb745a ("ath9k: discard undersized packets")
Signed-off-by: Zefir Kurtisi <zefir.kurtisi@neratec.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Zefir Kurtisi 2019-06-11 15:36:56 +02:00 committed by Kalle Valo
parent d9e4769896
commit df5c415050
1 changed files with 5 additions and 1 deletions
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6
drivers/net/wireless/ath/ath9k/recv.c
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@ -815,6 +815,7 @@ static int ath9k_rx_skb_preprocess(struct ath_softc *sc,
struct ath_common *common = ath9k_hw_common(ah);
struct ieee80211_hdr *hdr;
bool discard_current = sc->rx.discard_next;
bool is_phyerr;
/*
* Discard corrupt descriptors which are marked in
@ -827,8 +828,11 @@ static int ath9k_rx_skb_preprocess(struct ath_softc *sc,
/*
* Discard zero-length packets and packets smaller than an ACK
* which are not PHY_ERROR (short radar pulses have a length of 3)
*/
if (rx_stats->rs_datalen < 10) {
is_phyerr = rx_stats->rs_status & ATH9K_RXERR_PHY;
if (!rx_stats->rs_datalen ||
(rx_stats->rs_datalen < 10 && !is_phyerr)) {
RX_STAT_INC(sc, rx_len_err);
goto corrupt;
}