linux-kernel - Re: [PATCH] libata: Forcing PIO0 mode on reset must not freeze system

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Date:	Mon, 11 Feb 2008 19:49:17 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Tejun Heo <htejun@...il.com>, linux-kernel@...r.kernel.org,
	linux-ide@...r.kernel.org, alan@...hat.com, jeff@...zik.org
Subject: Re: [PATCH] libata: Forcing PIO0 mode on reset must not freeze	system

Hello,

Holger Macht wrote:
>> In the above example, even the reset sequence itself can cause hang if
>> the hardware is implemented slightly differently.  The reason why
>> set_piomode() locks up but reset sequence doesn't is simple dumb luck.
> 
> Another thing, whether it's poor luck or not, it worked like this than at
> least 2.6.22. And it was _heavily_ tested. The above commit broke it
> between 2.6.24-rc1 and 2.6.24-rc2, which is at least a regression.

Yes, in a sense but the change is in the area where there's no defined
behavior, so I don't think it's a good idea to revert the change here.
Let's concentrate on finding the proper solution.

Thanks.

-- 
tejun
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