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