linux-kernel - Re: status of: tasklet_unlock_wait() causes soft lockup with -rt and ieee1394 audio

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Message-ID: <45BB272F.3020508@joow.be>
Date:	Sat, 27 Jan 2007 11:19:27 +0100
From:	Pieter Palmers <pieterp@...w.be>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Lee Revell <rlrevell@...-job.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: status of: tasklet_unlock_wait() causes soft lockup with -rt
 and ieee1394	audio

Ingo Molnar wrote:
> * Pieter Palmers <pieterp@...w.be> wrote:
> 
>> Dear all,
>>
>> What is the status with respect to this problem? I see that in the 
>> current -rt patch the problematic code piece is different. I 
>> personally haven't tried to reproduce this myself on a more recent 
>> kernel, but I just got a report from one of our users who experienced 
>> the same problem with 2.6.19-rt15 and RT preemption (desktop 
>> preemption works fine).
>>
>> Should the latest -rt patches be fixed with respect to this issue? If 
>> so I'll try and test them, otherwise I omit the effort.
> 
> it's not fixed yet. Could you try the patch below?

I just compiled & installed 2.6.20-rc6-rt2, and I saw that this patch 
was in the -rt2 patch, so I gave real-time preemption a shot. It seems 
to work, I don't experience lockups anymore.

Thanks for the fix,

Pieter
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