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

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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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

Re: ath9k: freeze when putting interface up

[Nick Nobody]

I'm experiencing the exact same thing (with the same hardware). I'm
using 2.6.35.4 with compat-wireless-2010-08-21.

Running Bjørnar Hansen's test, my system will freeze around 20. Using
the version of ath9k that comes with 2.6.35.4 is impossible because the
system would freeze on the first "ifconfig wlan0 up". My wireless
connection is also a lot less stable compared to how it used to be with
a 2.6.32 kernel on Fedora 12 (I'm using Arch now).

I'll try to help in whatever way I can, just let me know what you need.

nick