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    SubjectRe: ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00008040
    Justin P. Mattock wrote:
    > yeah this works:
    >
    > eading symbols from
    > /home/kernel/linux-next/drivers/net/wireless/ath/ath9k/ath9k.o...done.
    > (gdb) l *(ath_tx_start+0x284)
    > 0xcad4 is in ath_tx_start (drivers/net/wireless/ath/ath9k/xmit.c:1878).
    > 1873 ieee80211_is_data_qos(hdr->frame_control)) {
    > 1874 tidno = ieee80211_get_qos_ctl(hdr)[0] &
    > 1875 IEEE80211_QOS_CTL_TID_MASK;
    > 1876 tid = ATH_AN_2_TID(txctl->an, tidno);
    > 1877
    > 1878 WARN_ON(tid->ac->txq != txctl->txq);
    > 1879 }
    > 1880
    > 1881 if ((tx_info->flags & IEEE80211_TX_CTL_AMPDU) && tid) {
    > 1882 /*
    > (gdb)

    Can you try this patch ?

    From: Sujith Manoharan <c_manoha@qca.qualcomm.com>
    Date: Tue, 20 Mar 2012 13:51:26 +0530
    Subject: [PATCH] ath9k: Use HW HT capabilites properly

    The commit "ath9k: Remove aggregation flags" changed how
    nodes were being initialized. Use the HW HT cap bits
    to initialize/de-initialize nodes, else we would be
    accessing an uninitialized entry during a suspend/resume cycle,
    resulting in a panic.

    Reported-by: Justin P. Mattock <justinmattock@gmail.com>
    Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
    ---
    drivers/net/wireless/ath/ath9k/main.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
    index 3879485..215eb25 100644
    --- a/drivers/net/wireless/ath/ath9k/main.c
    +++ b/drivers/net/wireless/ath/ath9k/main.c
    @@ -640,7 +640,7 @@ static void ath_node_attach(struct ath_softc *sc, struct ieee80211_sta *sta,
    an->sta = sta;
    an->vif = vif;

    - if (sta->ht_cap.ht_supported) {
    + if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_HT) {
    ath_tx_node_init(sc, an);
    an->maxampdu = 1 << (IEEE80211_HT_MAX_AMPDU_FACTOR +
    sta->ht_cap.ampdu_factor);
    @@ -659,7 +659,7 @@ static void ath_node_detach(struct ath_softc *sc, struct ieee80211_sta *sta)
    an->sta = NULL;
    #endif

    - if (sta->ht_cap.ht_supported)
    + if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_HT)
    ath_tx_node_cleanup(sc, an);
    }

    --
    1.7.9.4


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