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

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Date:	Tue, 15 May 2012 10:37:46 -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 2/3] block: add queue runtime pm callback

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.

Alan Stern

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