From: Tejun Heo <tj@kernel.org>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Lin Ming <ming.m.lin@intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-ide@vger.kernel.org" <linux-ide@vger.kernel.org>,
"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
Jeff Garzik <jgarzik@pobox.com>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
James Bottomley <JBottomley@parallels.com>,
"Huang, Ying" <ying.huang@intel.com>,
"Zhang, Rui" <rui.zhang@intel.com>
Subject: Re: [PATCH v3 3/6] [SCSI] runtime resume device before system suspend
Date: Thu, 24 Nov 2011 11:57:03 -0800 [thread overview]
Message-ID: <20111124195703.GA6735@google.com> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1111241123030.21532-100000@netrider.rowland.org>
Hello,
On Thu, Nov 24, 2011 at 11:36:20AM -0500, Alan Stern wrote:
> I think this email discussion has answered his objection: The only SCSI
> top-level driver implementing runtime suspend is sd, and sd treats
> runtime suspend the same as system sleep. It might be a good idea to
> add a comment with this explanation along with the new code, however.
Hmmm... I see. This shouldn't affect host controller states - we'll
be skipping only the drive PM transitions, right? As long as it's
well documented, I guess it's okay but at the same time I don't think
it's such a big deal to spin up drives when the system is entering
hibernation from runtime powersave. On most systems, they'll need to
be spun up for image dump pretty soon anyway.
Thanks.
--
tejun
next prev parent reply other threads:[~2011-11-24 19:57 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-23 7:01 [PATCH v3 0/6] ata port runtime power management support Lin Ming
2011-11-23 7:01 ` [PATCH v3 1/6] ata: make ata port as parent device of scsi host Lin Ming
2011-11-23 7:01 ` [PATCH v3 2/6] scsi: add flag to skip the runtime PM calls on the host Lin Ming
2011-11-23 7:01 ` [PATCH v3 3/6] [SCSI] runtime resume device before system suspend Lin Ming
2011-11-23 17:02 ` Alan Stern
2011-11-24 12:21 ` Lin Ming
2011-11-24 16:36 ` Alan Stern
2011-11-24 19:57 ` Tejun Heo [this message]
2011-11-24 22:54 ` Alan Stern
2011-11-24 23:01 ` Tejun Heo
2011-11-25 0:17 ` Alan Stern
2011-11-25 13:50 ` Lin Ming
2011-11-25 15:19 ` Alan Stern
2011-11-23 7:01 ` [PATCH v3 4/6] [SCSI] sd: check runtime status in sd_shutdown Lin Ming
2011-11-23 7:01 ` [PATCH v3 5/6] ata: add ata port system PM callbacks Lin Ming
2011-11-23 7:01 ` [PATCH v3 6/6] ata: add ata port runtime " Lin Ming
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