linux-kernel - Re: [fix] Too async libata breakage

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Date:	Thu, 08 Jan 2009 15:26:47 -0800
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	torvalds@...ux-foundation.org, Pekka Paalanen <pq@....fi>,
	Alexey Dobriyan <adobriyan@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [fix] Too async libata breakage

Arjan van de Ven wrote:
> On Thu, 08 Jan 2009 14:20:38 -0800
> "Justin P. Mattock" <justinmattock@...il.com> wrote:
>
>   
>> Arjan van de Ven wrote:
>>     
>>>>> Additional async_synchronize_full() helps and box boot to the end.
>>>>>       
>>>>>           
>>> Hi Linus,
>>>
>>> can you add the patch below to your tree? This makes the
>>> async_synchronize_full() a real absolute async barrier, rather than
>>> just synchronizing the work scheduled upto the starting point.
>>> It's a bit too much for some cases (so later on I might introduce
>>> the softer synchronization again) but it solves some real problems
>>> for people so this should go into -rc1 please...
>>>
>>> >From ca1827b142e41b54c612026b3c0b5d239f21a715 Mon Sep 17 00:00:00
>>>       
>>>> 2001
>>>>         
>>> From: Arjan van de Ven <arjan@...ux.intel.com>
>>> Date: Thu, 8 Jan 2009 12:35:11 -0800
>>> Subject: [PATCH] async: make async_synchronize_full() more
>>> serializing
>>>
>>> turns out that there are real problems with allowing async
>>> tasks that are scheduled from async tasks to run after
>>> the async_synchronize_full() returns.
>>>
>>> This patch makes the _full more strict and a complete
>>> synchronization. Later I might need to add back a lighter
>>> form of synchronization for other uses.. but not right now.
>>>
>>> Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>
>>> ---
>>>  kernel/async.c |    4 +++-
>>>  1 files changed, 3 insertions(+), 1 deletions(-)
>>>
>>> diff --git a/kernel/async.c b/kernel/async.c
>>> index 9737338..64cc916 100644
>>> --- a/kernel/async.c
>>> +++ b/kernel/async.c
>>> @@ -206,7 +206,9 @@ EXPORT_SYMBOL_GPL(async_schedule_special);
>>>  
>>>  void async_synchronize_full(void)
>>>  {
>>> -	async_synchronize_cookie(next_cookie);
>>> +	do {
>>> +		async_synchronize_cookie(next_cookie);
>>> +	} while (!list_empty(&async_running)
>>> || !list_empty(&async_pending)); }
>>>  EXPORT_SYMBOL_GPL(async_synchronize_full);
>>>  
>>>   
>>>       
>> I have to say that ohci/firescope is nice
>> poof right up: dmesg shows up:
>> attach is the results.
>> unfortunantly nothing different than
>> what the boot screen shows.
>>     
>
> just to make clear: this is with the patch right?
> because if not... try that..
>
>   
this is without,
I'll have to give that patch a try.

regards;

Justin P. Mattock
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