Re: ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00008040

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On 03/19/2012 08:33 AM, Felix Fietkau wrote:
On 2012-03-19 4:25 PM, Justin P. Mattock wrote:
On 03/19/2012 08:20 AM, Mohammed Shafi wrote:
Hi Justin,

seems I got this when waking up from suspend, was trying to connect with NM
then all of a sudden Xorg shut off and this appeared on the screen(image
links below I could not save dmesg only pic)
http://flic.kr/p/bEhf2K
http://flic.kr/p/bEhf2x
http://flic.kr/p/bEhf2n
http://flic.kr/p/bEhf26

I see ath9k in the image, but am unsure if its related.
kernel is: 3.3.0-rc7-next-20120316

this looks like some new issue  in ath9k, lets try to recreate it here


Justin P. Mattock







would be nice to recreate, then bisecting will be more accurate to do..
I am trying userspace tweaks here and there but no luck(hostapd etc..)
keep in mind this is for the RX DMA, the above just occured..
as for writing a small app I still need to try, but my C skills only go
so far(anything to trigger!).
Was your kernel compiled with debug info? If so, please run gdb on the
ath9k.ko module and enter this:
l *ath9k_tx+start+0x284
Then send me the output of that.

- Felix


I changed the Cc''s so hopefully its correct..
 anyway I tried the above but might have gotten it wrong..:

Reading symbols from /home/kernel/linux-next/drivers/net/wireless/ath/ath9k/ath9k.o...done.
(gdb) list *ath9k_tx+0xa3
0x4673 is in ath9k_tx (drivers/net/wireless/ath/ath9k/main.c:1136).
1131		memset(&txctl, 0, sizeof(struct ath_tx_control));
1132		txctl.txq = sc->tx.txq_map[skb_get_queue_mapping(skb)];
1133	
1134		ath_dbg(common, XMIT, "transmitting packet, skb: %p\n", skb);
1135	
1136		if (ath_tx_start(hw, skb, &txctl) != 0) {
1137			ath_dbg(common, XMIT, "TX failed\n");
1138			goto exit;
1139		}
1140	
(gdb) list *ath9k_tx+start+0x284
No symbol "start" in current context.

before receiving the email to do the above code with gdb I had cleaned the tree out with git clean -fx so rebuilding might have misalighned things(but could be wrong)..

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