linux-kernel - Re: [RFC PATCH 2/3] block: add queue runtime pm callback

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Message-ID: <1337096188.3515.3.camel@chief-river-32>
Date:	Tue, 15 May 2012 23:36:28 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Alan Stern <stern@...land.harvard.edu>
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 2/3] block: add queue runtime pm callback

On Tue, 2012-05-15 at 10:37 -0400, Alan Stern wrote:
> On Tue, 15 May 2012, Lin Ming wrote:
> 
> > Add ->runtime_pm callback and ->pm_status to request queue.
> > As an example, implement a simple queue runtime_pm callback
> > in sd driver.
> 
> > +static int sd_runtime_pm_fn(struct request_queue *q, pm_message_t mesg)
> > +{
> > +	struct scsi_device *sdp = q->queuedata;
> > +
> > +	if (mesg.event == PM_EVENT_SUSPEND) {
> > +		q->pm_status = RPM_SUSPENDING;
> > +		pm_runtime_put(&sdp->sdev_gendev);
> > +	}
> > +	else if (mesg.event == PM_EVENT_RESUME) {
> > +		q->pm_status = RPM_RESUMING;
> > +		pm_runtime_get(&sdp->sdev_gendev);
> > +	}
> 
> Don't use pm_message_t arguments for runtime PM.  Implement separate 
> routines for suspend and resume.

OK, I'll add 2 callbacks to request_queue.

runtime_pm_fn runtime_suspend;
runtime_pm_fn runtime_resume;

> 
> Alan Stern
> 


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