linux-kernel - Re: [PATCH 2/3] scsi: add hooks for host runtime power management

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Message-ID: <CAOS58YN1WByGtr1MNH12vbPVa-vyWa-LiHYgMWSJt1WbfK-vtw@mail.gmail.com>
Date:	Thu, 3 Nov 2011 08:51:46 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Lin Ming <ming.m.lin@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Jeff Garzik <jgarzik@...ox.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	James Bottomley <JBottomley@...allels.com>,
	"Huang, Ying" <ying.huang@...el.com>,
	"Zhang, Rui" <rui.zhang@...el.com>
Subject: Re: [PATCH 2/3] scsi: add hooks for host runtime power management

Hello,

On Thu, Nov 3, 2011 at 8:39 AM, Alan Stern <stern@...land.harvard.edu> wrote:
>> I don't know. I haven't really thought about it but as it's currently
>> designed, I don't think it'll be possible to avoid going through EH to
>> put ATA ports into suspend mode.
>
> Why not?

It's just how things are designed now.  There's no reason why it's
fundamentally impossible but going around that would require some
amount of hackery or preferably re-design.  Synchronization against
command processing, interrupts and all are built around EH.

Thanks.

-- 
tejun
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