linux-kernel - Re: [RFC PATCH v3 0/4]: block layer runtime pm

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Message-ID: <Pine.LNX.4.44L0.1205231124460.1566-100000@iolanthe.rowland.org>
Date:	Wed, 23 May 2012 11:27:19 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Lin Ming <ming.m.lin@...el.com>
cc:	Jens Axboe <axboe@...nel.dk>, <linux-kernel@...r.kernel.org>,
	<linux-pm@...r.kernel.org>, <linux-scsi@...r.kernel.org>
Subject: Re: [RFC PATCH v3 0/4]: block layer runtime pm

On Wed, 23 May 2012, Lin Ming wrote:

> On Wed, May 23, 2012 at 11:03 PM, Alan Stern <stern@...land.harvard.edu> wrote:
> > On Wed, 23 May 2012, Lin Ming wrote:
> >
> >> Another thing need to check is if system suspend/resume works.
> >
> > Right!  Although I would hope that your work doesn't interfere at all
> > with system sleep, since it touches only the runtime PM pathways.
> 
> sd_sync_cache and sd_start_stop_device are changed with REQ_PM set.
> And they are called for system suspend too.
> 
> So it probably will have problem.

People have already run into problems where system suspend 
occurred at a time when a SCSI device was already runtime suspended.  
That's why scsi_bus_suspend_common() includes an appropriate check.

Alan Stern

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