linux-kernel - Re: [PATCH] ide-cd: Handle strange interrupt on the Intel ESB2

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Message-ID: <45760B87.5050402@gmail.com>
Date:	Wed, 06 Dec 2006 09:15:03 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Alan <alan@...rguk.ukuu.org.uk>
CC:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-kernel@...r.kernel.org, akpm@...l.org,
	Jeff Garzik <jgarzik@...ox.com>
Subject: Re: [PATCH] ide-cd: Handle strange interrupt on the Intel ESB2

Alan wrote:
> On Wed, 6 Dec 2006 00:23:03 +0100
> "Bartlomiej Zolnierkiewicz" <bzolnier@...il.com> wrote:
> 
>> Looks good but aren't this trying to fix the same ICH
>> issue that is fixed in libata by ap->ops->irq_clear(ap)?
>>
>> [ please see Tejun's mail: http://lkml.org/lkml/2006/11/15/94 ]
>>
>> If so shouldn't we apply this fix for all ICH5/6/7/8 chipsets?
> 
> Possibly. Thats one reason I made it a quirk bit. I'd certainly expect it
> to be a group of related chipsets.
> 
>> Also shouldn't the fix be in IRQ handler?  Currently the fix is limited
>> to ide-cd driver which seems to be the wrong place as the problem
>> is supposed to happen also when using other IDE device drivers
>> or/and other ATA/ATAPI devices?
> 
> The problem has only be observed with CD devices doing PIO ATAPI
> commands. I am not aware of an Intel errata document that characterises
> this errata so anything else so cannot guess further. Perhaps Intel can
> advise ?

FWIW, on my ICH7, the IRQ storm does occur on ATA devices.

-- 
tejun
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