linux-kernel - Re: 2.6.25-rc2 regression in rt61pci wireless driver

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Date:	Mon, 18 Feb 2008 19:11:31 +0100
From:	Ivo van Doorn <ivdoorn@...il.com>
To:	"Chris Clayton" <chris2553@...glemail.com>
Cc:	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org
Subject: Re: 2.6.25-rc2 regression in rt61pci wireless driver

Hi,

> In 2.6.25 kernels, my wireless LAN dies after even the smallest amount
> of network activity. The following screen cut shows what I typically
> see:

How complete is this failure? Just TX or also RX?

Could you use the tools found here:
http://www-user.rhrk.uni-kl.de/~nissler/rt2x00/index.html

and capture all TX/RX frames going through the hardware?
Note that after the failure, this dumping facitilty should still report
any ping request you might send to the interface.

> [chris:~]$ uname -a
> Linux laptop 2.6.25-rc2 #10 PREEMPT Sat Feb 16 09:53:04 UTC 2008 i686
> GNU/Linux
> [chris:~]$ ping 192.168.1.1
> PING 192.168.1.1 (192.168.1.1) from 192.168.1.30 : 56(84) bytes of data.
> 64 bytes from 192.168.1.1: icmp_seq=0 ttl=255 time=9.837 msec
> 64 bytes from 192.168.1.1: icmp_seq=1 ttl=255 time=3.148 msec
> 64 bytes from 192.168.1.1: icmp_seq=2 ttl=255 time=2.205 msec

I have a series of tests I would like to request from you,
you mentioned you already enabled debugfs, and that is just what we need. ;)
Please use attached script to create dumps of the hardware register contents.

There are specific moments that should be dumped:
- kernel 2.6.24 (last known working version for you).
- kernel 2.6.25-rc2 (after ifup, before TX dies)
- kernel 2.6.25-rc2 (after ifup, after TX dies)
 
> I will be more than happy to provide additional diagnostics, but
> please bear in mind that I am not a git user, so cannot do bisects. I
> am, however, perfectly capable of applying or reverting patches,
> rebuilding and re-testing, so I am quite happy to do that.

Above traces should be enough, but to determine where rt2x00 broke
down approximatly I need to have a few test result on specific moments.
Could you test the kernel with the following versions:

rt2x00 2.0.11	2d68de3efa62655d551092f5c787505735d561ad
rt2x00 2.0.12	a3c7aa58df7df80aa05f166fe3e42482247164cf
rt2x00 2.0.13	5a6012e105ae1664cd2841c33bf59fbdd8d4dbcc

Checking those out is simply a matter of:
git branch 2.0.11 2d68de3efa62655d551092f5c787505735d561ad
git checkout 2.0.11

No further bisecting is needed, but with above tests I can at least
narrow it down to find the cause of this issue.

Thanks.

Ivo

Download attachment "debugfsdump.sh" of type "application/x-shellscript" (432 bytes)