linux-kernel - Re: [PATCH 1/1] ath5k: fix hw rate index condition

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Message-ID: <20090331035140.GC4199@linux.vnet.ibm.com>
Date:	Tue, 31 Mar 2009 09:21:40 +0530
From:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
To:	Bob Copeland <me@...copeland.com>
Cc:	Jiri Slaby <jirislaby@...il.com>,
	Dhaval Giani <dhaval.lists@...gianis.in>,
	linville@...driver.com, davem@...emloft.net,
	linux-wireless@...r.kernel.org, ath5k-devel@...ema.h4ckr.net,
	Nick Kossifidis <mickflemm@...il.com>,
	"Luis R. Rodriguez" <lrodriguez@...eros.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] ath5k: fix hw rate index condition

On Mon, Mar 30, 2009 at 02:13:35PM -0400, Bob Copeland wrote:
> On Mon, Mar 30, 2009 at 1:59 PM, Dhaval Giani <dhaval@...ux.vnet.ibm.com> wrote:
> > ok, so my kernel does hve this patch applied, and this is what I get,
> >
> >  ------------[ cut here ]------------
> >  WARNING: at include/net/mac80211.h:1956 minstrel_get_rate+0xa1/0x4b9 [mac80211]()
> 
> I believe this is something different (tx path not rx).  I think it's
> that minstrel rate table bug again, which we never solved for ath5k.
> 
> Are you using adhoc or managed mode?  Do you have the slab/slub debugging
> options turned on?  Any steps that consistently reproduce it?  Do you
> get any warnings with PID controller?
> 

[dhaval@...dor ~]$ iwconfig wlan0
wlan0     IEEE 802.11abg  ESSID:"linksys_SES_62338"
          Mode:Managed  Frequency:2.462 GHz  Access Point: 00:1A:70:D6:2D:06
          Bit Rate=36 Mb/s   Tx-Power=23 dBm
          Retry min limit:7   RTS thr:off   Fragment thr=2352 B
          Power Management:off
          Link Quality=100/100  Signal level:-49 dBm  Noise level=-96 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

[dhaval@...dor ~]$

[dhaval@...dor linux-2.6]$ grep -i slub .config
CONFIG_SLUB_DEBUG=y
CONFIG_SLUB=y
# CONFIG_SLUB_DEBUG_ON is not set
# CONFIG_SLUB_STATS is not set
[dhaval@...dor linux-2.6]$

Am not sure what the PID controller is, and google gave me a number of
results, which did not make too much sense in the context.

Yes, I think I know how to reproduce it, but I am not sure what is the
real cause.

One way I have found of reproducing it is to connect to open networks,
but it does not happen always. At home, when my network is set to open,
I do not see this issue, whereas at the airport, kaboom.

I've also seen it on LEAP networks, but there were also a few open
networks around. This warning is generally accompanied by a disconnect
from the LEAP connected network, and then the system reconnects. Let me
know if you have patches, I can give them a run and report back.

Thanks,
-- 
regards,
Dhaval
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