ath9k: freeze when putting interface up

ath9k: freeze when putting interface up

[Bjørnar Hansen]

Good morning

With kernel 2..6.35.2 my computer locks up when doing
  # ifconfig wlan0 up

I have now installed compat-wireless (2010-08-20), and no longer have
this problem.
I use the ath9k driver.

As this is a pretty serious problem (machine freezes completely),
would it be possible to pull some patches from compat-wireless into
the next point release of 2.6.35?


-Bjørnar Hansen

Re: ath9k: freeze when putting interface up

[Luis R. Rodriguez]

On Sun, Aug 22, 2010 at 8:57 AM, Bjørnar Hansen <tilbjornar@gmail.com> wrote:
> Good morning
>
> With kernel 2..6.35.2 my computer locks up when doing
>  # ifconfig wlan0 up

What chipset do you have? You can find this from dmesg after loading ath9k.

> I have now installed compat-wireless (2010-08-20), and no longer have
> this problem.
> I use the ath9k driver.
>
> As this is a pretty serious problem (machine freezes completely),
> would it be possible to pull some patches from compat-wireless into
> the next point release of 2.6.35?

Absolutely, if we can determine what happened. First we need to reproduce.

 Luis

Re: ath9k: freeze when putting interface up

[Bjørnar Hansen]

Hi


> What chipset do you have? You can find this from dmesg after loading ath9k.
>

The chipset is AR9285 Rev: 2.

I recompiled my kernel with atheros debugging support. Here is the
output from after bringing up wlan0:

Aug 24 21:13:16 localhost kernel: [  323.948242] ath: Starting driver
with initial channel: 2412 MHz
Aug 24 21:13:16 localhost kernel: [  323.949260] ath: FULL-SLEEP -> AWAKE
Aug 24 21:13:16 localhost kernel: [  323.955212] ath: PDADC (0,   0):
a280 00000000
Aug 24 21:13:16 localhost kernel: [  323.955216] ath: PDADC: Chain 0 |
PDADC   0 Value   0 | PDADC   1 Value   0 | PDADC   2 Value   0 |
PDADC   3 Value   0 |
Aug 24 21:13:16 localhost kernel: [  323.955223] ath: PDADC (0,   0):
a284 02000000
Aug 24 21:13:16 localhost kernel: [  323.955227] ath: PDADC: Chain 0 |
PDADC   4 Value   0 | PDADC   5 Value   0 | PDADC   6 Value   0 |
PDADC   7 Value   2 |
Aug 24 21:13:16 localhost kernel: [  323.955234] ath: PDADC (0,   0):
a288 0a080604
Aug 24 21:13:16 localhost kernel: [  323.955237] ath: PDADC: Chain 0 |
PDADC   8 Value   4 | PDADC   9 Value   6 | PDADC  10 Value   8 |
PDADC  11 Value  10 |
Aug 24 21:13:16 localhost kernel: [  323.955244] ath: PDADC (0,   0):
a28c 12100e0c
Aug 24 21:13:16 localhost kernel: [  323.955247] ath: PDADC: Chain 0 |
PDADC  12 Value  12 | PDADC  13 Value  14 | PDADC  14 Value  16 |
PDADC  15 Value  18 |
Aug 24 21:13:16 localhost kernel: [  323.955254] ath: PDADC (0,   0):
a290 1a181614
Aug 24 21:13:16 localhost kernel: [  323.955257] ath: PDADC: Chain 0 |
PDAAug 24 21:18:29 localhost kernel: [    0.000000] Initializing
cgroup subsys cpuset

As you see, logging was interrupted in the middle of a line.

Sometimes I can bring the interface up and down multiple times before freezing.


-Bjørnar

Re: ath9k: freeze when putting interface up

[Bjørnar Hansen]

Hi again,

I managed to use git bisect to pinpoint the exact commit that causes
my laptop to freeze:

53bc7aa08b48e5cd745f986731cc7dc24eef2a9f is the first bad commit
commit 53bc7aa08b48e5cd745f986731cc7dc24eef2a9f
Author: Vivek Natarajan <vnatarajan@atheros.com>
Date:   Mon Apr 5 14:48:04 2010 +0530

    ath9k: Add support for newer AR9285 chipsets.

    This patch adds support for a modified newer version of AR9285
    chipsets.

    Signed-off-by: Vivek Natarajan <vnatarajan@atheros.com>
    Signed-off-by: John W. Linville <linville@tuxdriver.com>


I'm CC'ing this to Vivek also.
The chipset is reported as AR9285 rev 01. by lspci (I previously
stated it was rev 2, this is wrong).

While bisecting I found a reliable way to reproduce the freeze. I
devised a script to continuously bring the interface up and down:

COUNTER=1
while(true); do
    sudo ifconfig wlan0 up &&
    sudo ifconfig wlan0 down &&
    echo $COUNTER &&
    let COUNTER=COUNTER+1
done

On stable kernels I let it run to around 150. On unstable kernels it
reached at most 8.


-Bjørnar

Re: ath9k: freeze when putting interface up

[Luis R. Rodriguez]

On Sun, Sep 5, 2010 at 12:49 PM, Bjørnar Hansen <tilbjornar@gmail.com> wrote:
> Hi again,
>
> I managed to use git bisect to pinpoint the exact commit that causes
> my laptop to freeze:
>
> 53bc7aa08b48e5cd745f986731cc7dc24eef2a9f is the first bad commit
> commit 53bc7aa08b48e5cd745f986731cc7dc24eef2a9f
> Author: Vivek Natarajan <vnatarajan@atheros.com>
> Date:   Mon Apr 5 14:48:04 2010 +0530
>
>    ath9k: Add support for newer AR9285 chipsets.
>
>    This patch adds support for a modified newer version of AR9285
>    chipsets.
>
>    Signed-off-by: Vivek Natarajan <vnatarajan@atheros.com>
>    Signed-off-by: John W. Linville <linville@tuxdriver.com>
>
>
> I'm CC'ing this to Vivek also.
> The chipset is reported as AR9285 rev 01. by lspci (I previously
> stated it was rev 2, this is wrong).
>
> While bisecting I found a reliable way to reproduce the freeze. I
> devised a script to continuously bring the interface up and down:
>
> COUNTER=1
> while(true); do
>    sudo ifconfig wlan0 up &&
>    sudo ifconfig wlan0 down &&
>    echo $COUNTER &&
>    let COUNTER=COUNTER+1
> done
>
> On stable kernels I let it run to around 150. On unstable kernels it
> reached at most 8.

Some attention to this would be appreciated.

  Luis

undefined reference to `ar71xx_add_device_dsa' ???

[Robert Chan]

Dear all,

I am trying to compile backfire with virtually the default config I
downloaded, except that:

1.  Changed the default platform to ar71xx/TP-Link TL-WR741ND v1;
2.  Enabled mesh networking (pre-802.11s) support (in Networking
Support).

And nothing else.  Then I got the following error:

....................
arch/mips/ar71xx/built-in.o: In function `ap91_eth_init':
(.init.text+0x13b8): undefined reference to `ar71xx_add_device_dsa'
arch/mips/ar71xx/built-in.o: In function `ap91_eth_init':
(.init.text+0x13b8): relocation truncated to fit: R_MIPS_26 against
`ar71xx_add_device_dsa'
make[5]: *** [vmlinux] Error 1
......................

Can anyone please give me some pointer?

Thanks very much in advance.

Regards,

Robert

Re: undefined reference to `ar71xx_add_device_dsa' ???

[Florian Fainelli]

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Hello,

Le Sunday 5 September 2010 06:25:58, Robert Chan a écrit :
> Dear all,
> 
> I am trying to compile backfire with virtually the default config I
> downloaded, except that:
> 
> 1.  Changed the default platform to ar71xx/TP-Link TL-WR741ND v1;
> 2.  Enabled mesh networking (pre-802.11s) support (in Networking
> Support).
> 
> And nothing else.  Then I got the following error:
> 
> ....................
> arch/mips/ar71xx/built-in.o: In function `ap91_eth_init':
> (.init.text+0x13b8): undefined reference to `ar71xx_add_device_dsa'
> arch/mips/ar71xx/built-in.o: In function `ap91_eth_init':
> (.init.text+0x13b8): relocation truncated to fit: R_MIPS_26 against
> `ar71xx_add_device_dsa'
> make[5]: *** [vmlinux] Error 1
> ......................
> 
> Can anyone please give me some pointer?

Your question should be directed to the openwrt-devel mailing-list. Thank you.
--
Florian

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