linux-kernel - Re: [patch 1/3] libata: check for AN support

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Message-ID: <460B1E24.3080502@pobox.com>
Date:	Wed, 28 Mar 2007 22:02:12 -0400
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Tejun Heo <htejun@...il.com>
CC:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	linux-ide@...r.kernel.org
Subject: Re: [patch 1/3] libata: check for AN support

Tejun Heo wrote:
> Kristen Carlson Accardi wrote:
>> Check to see if an ATAPI device supports Asynchronous Notification.
>> If so, enable it.
> 
> As supporting AN needs host interrupt handler change.  I think we need 
> host-supports-AN flag; otherwise, we might end up with screaming 
> interrupts in the worst case.

Quite so.  Lacking a host flag, we need to know how each and every 
controller behaves when AN is activated (and supported by the device). 
I'm willing to bet some of the first-gen SATA controllers' ASIC state 
machines croak when AN is activated.

	Jeff



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