Message-ID: <4B1D7A6B.1080606@gmail.com>
Date: Mon, 07 Dec 2009 22:58:03 +0100
From: Gertjan van Wingerde <gwingerde@gmail.com>
MIME-Version: 1.0
To: Tim Blechmann <tim@klingt.org>
CC: Andi Kleen <andi@firstfloor.org>, rjw@sisk.pl, IvDoorn@gmail.com,
	linville@tuxdriver.com, linux-wireless@vger.kernel.org
Subject: Re: regression: rt2561 frequent "Arrived at non-free entry" errors
 in	2.6.32
References: <20091204233202.GA13658@basil.fritz.box> <4B1BB44E.90706@gmail.com> <4B1CCB81.5060104@klingt.org>
In-Reply-To: <4B1CCB81.5060104@klingt.org>
Content-Type: multipart/mixed;
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Sender: linux-wireless-owner@vger.kernel.org

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On 12/07/09 10:31, Tim Blechmann wrote:
> On 12/06/2009 02:40 PM, Gertjan van Wingerde wrote:
>> On 12/05/09 00:32, Andi Kleen wrote:
>>> [Rafael, something for your regression list]
>>>
>>> I upgraded a system which was running 2.6.30 to 2.6.32.
>>> It has a 
>>>
>>> 06:02.0 Network controller: RaLink RT2561/RT61 802.11g PCI
>>>
>>> wireless PCI card. Now regularly even under moderate traffic
>>> I see messages like
>>>
>>> phy0 -> rt2x00queue_write_tx_frame: Error - Arrived at non-free entry in the non-full queue 2.
>>> Please file bug report to http://rt2x00.serialmonkey.com.
>>>
>>> and loss of connectivity, often until the wireless connection
>>> is restarted. This wasn't the case in 2.6.30, there the driver
>>> ran stable without any problems. The problem currently
>>> happens every few minutes.
>>>
>>
>> Andi, Tim,
>>
>> Both of you have reported this problem on 2.6.32.
>>
>> In the past this always has occurred due to queue locking problems. This led me
>> to audit the queue locking code, and that certainly looked suspicious to me.
>>
>> Would you be able to test whether the attached test patch fixes the problem for
>> you. The patch basically applies proper queue locking to the code, although in 
>> a very course manner. The patch is relative to 2.6.32.
>>
>> Note: I am not 100% sure that this is where the problem is, but at least the test
>> patch should confirm whether I am searching in the right direction.
> 
> the patch didn't cleanly apply to v2.6.32 and the patched kernel didn't
> boot ... which tree should it be applied on?
> 

Yeah, I knew it didn't apply cleanly, as it was prepared on latest wireless-testing and
then stripped of unnecessary things. Find an updated patch attached. This one is completely
the same, only line numbers of where to apply changed.

I can't reproduce any boot failures with the patch applied, although for me the rt2x00
drivers are compiled as modules. Can you provide some more information on the boot failure
that you see?

---
Gertjan.

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