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

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Message-ID: <Pine.LNX.4.44L0.1111031139150.2136-100000@iolanthe.rowland.org>
Date:	Thu, 3 Nov 2011 11:39:33 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Tejun Heo <tj@...nel.org>
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

On Thu, 3 Nov 2011, Tejun Heo wrote:

> Hello,
> 
> On Thu, Nov 3, 2011 at 7:37 AM, Lin Ming <ming.m.lin@...el.com> wrote:
> >> Yes, it is a problem.  But it looks like the underlying issue is that
> >> you're using the SCSI error handler to do something it was not intended
> >> for.  Can't you suspend and resume the ATA port without using the error
> >> handler?
> >
> > The system suspend and resume of the ATA port uses the error handler.
> > I think the runtime suspend and resume should use the error handler too.
> >
> > Tejun,
> >
> > Could you comment more on this?
> 
> 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?

Alan Stern

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