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

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Date:	Tue, 20 Mar 2012 13:14:40 +0530
From:	Mohammed Shafi <shafi.wireless@...il.com>
To:	"Justin P. Mattock" <justinmattock@...il.com>
Cc:	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

> /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

please check with the attached debug patch if tid is 'NULL'


its my theory that tid is not initialized in ath_tx_node_init just after resume.
during suspend ath9k_sta_remove may be called
ieee80211_suspend -> drv_sta_state ->
drv_sta_remove->ath9k_sta_remove->ath_node_detach->ath_tx_node_cleanup

during resume

ieee80211_resume ->
ieee80211_reconfig->drv_sta_state->ath9k_sta_add->ath_node_attach->ath_tx_node_init

now sta.ht_cap.ht_supported should be true. it will be set to true in
assoc_sucess path and then sta_add is called.

let me see if i had missed something or my analysis itself is wrong.

>



-- 
thanks,
shafi

View attachment "debug-panic.patch" of type "text/x-diff" (493 bytes)