[ath9k-devel] WiFi Failure with AR9280

[Pannirselvam Kanagaratnam <pannir@xsmail.com>]

On 25/3/2013 12:39 AM, Felix Fietkau wrote:
> On 2013-03-24 5:26 PM, Pannirselvam Kanagaratnam wrote:
>> Hello,
>>
>> My WiFi connection drops while running the AR9280 on a Freescale
>> MPC8315E platform in AP mode with hostapd. I get the following error
>> within 15 seconds and the WiFi connection drops. However, I do not
>> observe any issues when using the AR9382. Can you let me know what could
>> be causing this and if there is a workaround for this. I am using
>> Compat-Wireless-3.5.4.1.
> I suggest updating to a more recent version of compat-wireless - 3.5.4.1
> is quite old.
> If a similar failure still occurs there, make sure you turn on
> CONFIG_KALLSYMS so that the trace is not just a long list of meaningless
> numbers.
>
> - Felix
>
Here are my logs with Compat 3.9-rc2 and CONFIG_KALLSYMS enabled.

ath: phy0: Failed to stop TX DMA, queues=0x004!
ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 
AR_DIAG_SW=0x42000020 DMADBG_7=0x000062c0
ath: phy0: Could not stop RX, we could be confusing the DMA engine when 
we start RX up
------------[ cut here ]------------
Badness at 
/build/compat-wireless-3.9-rc2-2-su/drivers/net/wireless/ath/ath9k/recv.c:487
NIP: c9b72eec LR: c9b72ee0 CTR: c01bc900
REGS: c6c63e30 TRAP: 0700   Not tainted  (2.6.35)
MSR: 00029032 <EE,ME,CE,IR,DR>  CR: 22002022  XER: 20000000
TASK = c7859360[930] 'phy0' THREAD: c6c62000
GPR00: 00000001 c6c63ee0 c7859360 0000004c 00005665 ffffffff c01b9e70 
00004000
GPR08: 00000000 c9b90000 00005665 c046ad78 22002082 00000000 07ff9000 
00000000
GPR16: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
0000000a
GPR24: 00000000 c6c66b4c c6c68030 00000000 00000000 00000000 c6c68010 
c6c65740
NIP [c9b72eec] ath_stoprecv+0x13c/0x154 [ath9k]
LR [c9b72ee0] ath_stoprecv+0x130/0x154 [ath9k]
Call Trace:
[c6c63ee0] [c9b72ee0] ath_stoprecv+0x130/0x154 [ath9k] (unreliable)
[c6c63f10] [c9b6ec20] ath_prepare_reset+0x54/0x90 [ath9k]
[c6c63f30] [c9b6ee90] ath_reset_internal+0x6c/0x220 [ath9k]
[c6c63f60] [c9b6f948] ath_reset+0x28/0x9c [ath9k]
[c6c63f80] [c0039398] worker_thread+0x108/0x1b0
[c6c63fc0] [c003d338] kthread+0x78/0x7c
[c6c63ff0] [c0010f08] kernel_thread+0x4c/0x68
Instruction dump:
2f800000 419eff74 809f0888 3c60c9b8 3ca0c9b8 38637194 38a572c8 38840020
4bec2125 3d20c9b9 88099475 68000001 <0f000000> 2f800000 419eff40 38000001
ath: phy0: Failed to stop TX DMA, queues=0x004!
ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 
AR_DIAG_SW=0x42000020 DMADBG_7=0x00006040
ath: phy0: Could not stop RX, we could be confusing the DMA engine when 
we start RX up

Regards,

Pannir