linux-kernel - Re: [RFC v2 PATCH 2/4] block: add queue runtime pm callbacks

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Message-ID: <Pine.LNX.4.44L0.1205211059510.1725-100000@iolanthe.rowland.org>
Date:	Mon, 21 May 2012 11:00:49 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Lin Ming <ming.m.lin@...el.com>
cc:	Jens Axboe <axboe@...nel.dk>, Jeff Moyer <jmoyer@...hat.com>,
	<linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	<linux-scsi@...r.kernel.org>
Subject: Re: [RFC v2 PATCH 2/4] block: add queue runtime pm callbacks

On Mon, 21 May 2012, Lin Ming wrote:

> On Fri, May 18, 2012 at 2:29 AM, Alan Stern <stern@...land.harvard.edu> wrote:
> [snip]
> > I may have left some parts out from this brief description.  Hopefully
> > you'll be able to figure out the general idea and get it to work.
> 
> All journal threads and flusher thread of the disk need to be freezed
> before suspend and thaw after resume.

Why?  If any of those threads needs to write something to the disk 
while the disk is suspended, the disk will simply be resumed.

Alan Stern

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