linux-kernel - Re: ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG

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Message-ID: <CAD2nsn1SxhX3MZTF+XYN=cQEfHuD9bu5_TuLtVOCNmVBoZNJ2A@mail.gmail.com>
Date:	Tue, 20 Mar 2012 17:06:23 +0530
From:	Mohammed Shafi <shafi.wireless@...il.com>
To:	Sujith Manoharan <c_manoha@....qualcomm.com>
Cc:	"Justin P. Mattock" <justinmattock@...il.com>,
	Linux-wireless <linux-wireless@...r.kernel.org>,
	Felix Fietkau <nbd@...nwrt.org>, linux-kernel@...r.kernel.org,
	Linux-netdev <netdev@...r.kernel.org>
Subject: Re: ath: DMA failed to stop in 10 ms AR_CR=0x00000024
 AR_DIAG_SW=0x02000020 DMADBG_7=0x00008040

On Tue, Mar 20, 2012 at 4:45 PM, Mohammed Shafi
<shafi.wireless@...il.com> wrote:
> On Tue, Mar 20, 2012 at 3:07 PM, Mohammed Shafi
> <shafi.wireless@...il.com> wrote:
>> Hi Sujith/Justin,
>>
>> On Tue, Mar 20, 2012 at 1:59 PM, Sujith Manoharan
>> <c_manoha@....qualcomm.com> wrote:
>>> 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 ?
>>
>> just found out that 'ht_supported' may not  be set, if assoc response
>> does not has ht_cap IE (or) if we could not parse it (why), then the
>> driver won't initialize those tid related structures ath_tx_node_init,
>> while we later access them in ath_tx_start. so this should fix the
>> issue.
>
> now i was able to quite easily recreate this issue in wireless testing
> even without suspend resume and with the patch the issue seems to get
> fixed.
> i was using 2ghz channel 6 and TKIP (no HT!).

i was keep on trying with 5ghz TKIP and it seems HT enable even with
TKIP (need to see why this happens), thats why even i could not
recreate this issue. mac80211 seems to disable HT, ht_supported false
while in driver we go with ATH9K_HW_CAP HT


>
>
>>
>>>
>>> From: Sujith Manoharan <c_manoha@....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@...il.com>
>>> Signed-off-by: Sujith Manoharan <c_manoha@....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
>>>
>>
>>
>>
>> --
>> thanks,
>> shafi
>
>
>
> --
> thanks,
> shafi



-- 
thanks,
shafi
--
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