Re: ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020DMADBG_7=0x00008040

[Justin P. Mattock]

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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