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ath9k: add a better fix for the rx tasklet vs rx flush race

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Ensure that the rx tasklet is no longer running when entering the reset path.
Also remove the distinction between flush and no-flush frame processing.
If a frame has been received and ACKed by the hardware, the stack needs to see
it, so that the BA receive window does not go out of sync.

Cc: stable@vger.kernel.org
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Felix Fietkau 2013-01-09 16:16:55 +01:00 committed by John W. Linville
parent 3adcf20afb
commit 7fc00a3054
5 changed files with 4 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/wireless/ath/ath9k/ath9k.h
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@ -646,7 +646,6 @@ void ath_ant_comb_update(struct ath_softc *sc);
enum sc_op_flags {
SC_OP_INVALID,
SC_OP_BEACONS,
SC_OP_RXFLUSH,
SC_OP_ANI_RUN,
SC_OP_PRIM_STA_VIF,
SC_OP_HW_RESET,

1
drivers/net/wireless/ath/ath9k/debug.c
View File

@ -861,7 +861,6 @@ static ssize_t read_file_recv(struct file *file, char __user *user_buf,
RXS_ERR("RX-LENGTH-ERR", rx_len_err);
RXS_ERR("RX-OOM-ERR", rx_oom_err);
RXS_ERR("RX-RATE-ERR", rx_rate_err);
RXS_ERR("RX-DROP-RXFLUSH", rx_drop_rxflush);
RXS_ERR("RX-TOO-MANY-FRAGS", rx_too_many_frags_err);
PHY_ERR("UNDERRUN ERR", ATH9K_PHYERR_UNDERRUN);

2
drivers/net/wireless/ath/ath9k/debug.h
View File

@ -216,7 +216,6 @@ struct ath_tx_stats {
* @rx_oom_err: No. of frames dropped due to OOM issues.
* @rx_rate_err: No. of frames dropped due to rate errors.
* @rx_too_many_frags_err: Frames dropped due to too-many-frags received.
* @rx_drop_rxflush: No. of frames dropped due to RX-FLUSH.
* @rx_beacons: No. of beacons received.
* @rx_frags: No. of rx-fragements received.
*/
@ -235,7 +234,6 @@ struct ath_rx_stats {
u32 rx_oom_err;
u32 rx_rate_err;
u32 rx_too_many_frags_err;
u32 rx_drop_rxflush;
u32 rx_beacons;
u32 rx_frags;
};

4
drivers/net/wireless/ath/ath9k/main.c
View File

@ -196,6 +196,8 @@ static bool ath_prepare_reset(struct ath_softc *sc, bool retry_tx, bool flush)
ath9k_debug_samp_bb_mac(sc);
ath9k_hw_disable_interrupts(ah);
tasklet_disable(&sc->intr_tq);
if (!ath_stoprecv(sc))
ret = false;
@ -210,6 +212,8 @@ static bool ath_prepare_reset(struct ath_softc *sc, bool retry_tx, bool flush)
ath_flushrecv(sc);
}
tasklet_enable(&sc->intr_tq);
return ret;
}

15
drivers/net/wireless/ath/ath9k/recv.c
View File

@ -286,7 +286,6 @@ int ath_rx_init(struct ath_softc *sc, int nbufs)
spin_lock_init(&sc->sc_pcu_lock);
spin_lock_init(&sc->rx.rxbuflock);
clear_bit(SC_OP_RXFLUSH, &sc->sc_flags);
common->rx_bufsize = IEEE80211_MAX_MPDU_LEN / 2 +
sc->sc_ah->caps.rx_status_len;
@ -501,11 +500,9 @@ bool ath_stoprecv(struct ath_softc *sc)
void ath_flushrecv(struct ath_softc *sc)
{
set_bit(SC_OP_RXFLUSH, &sc->sc_flags);
if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
ath_rx_tasklet(sc, 1, true);
ath_rx_tasklet(sc, 1, false);
clear_bit(SC_OP_RXFLUSH, &sc->sc_flags);
}
static bool ath_beacon_dtim_pending_cab(struct sk_buff *skb)
@ -1067,9 +1064,6 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
do {
bool decrypt_error = false;
/* If handling rx interrupt and flush is in progress => exit */
if (test_bit(SC_OP_RXFLUSH, &sc->sc_flags) && (flush == 0))
break;
memset(&rs, 0, sizeof(rs));
if (edma)
@ -1112,15 +1106,6 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
ath_debug_stat_rx(sc, &rs);
/*
* If we're asked to flush receive queue, directly
* chain it back at the queue without processing it.
*/
if (test_bit(SC_OP_RXFLUSH, &sc->sc_flags)) {
RX_STAT_INC(rx_drop_rxflush);
goto requeue_drop_frag;
}
memset(rxs, 0, sizeof(struct ieee80211_rx_status));
rxs->mactime = (tsf & ~0xffffffffULL) | rs.rs_tstamp;