linux-kernel - Re: [PATCH 1/3] [SCSI] sd: fix runtime status check in sd

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Date:	Thu, 15 Dec 2011 02:34:24 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Jeff Garzik <jgarzik@...ox.com>,
	James Bottomley <JBottomley@...allels.com>,
	Tejun Heo <tj@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 1/3] [SCSI] sd: fix runtime status check in sd_shutdown

On Thu, 2011-12-15 at 00:49 +0800, Alan Stern wrote:
> On Wed, 14 Dec 2011, Lin Ming wrote:
> 
> > Commit af8db15 disabled device's runtime PM during shutdown.
> > So sd's runtime status can't be checked with pm_runtime_suspended(dev)
> > any more.
> > 
> > Fix it by checking runtime status with pm_runtime_status_suspended(dev).
> > 
> > Signed-off-by: Lin Ming <ming.m.lin@...el.com>
> > ---
> >  drivers/scsi/sd.c |    7 ++++++-
> >  1 files changed, 6 insertions(+), 1 deletions(-)
> > 
> > diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
> > index 7b3f807..284b087 100644
> > --- a/drivers/scsi/sd.c
> > +++ b/drivers/scsi/sd.c
> > @@ -2742,7 +2742,12 @@ static void sd_shutdown(struct device *dev)
> >  	if (!sdkp)
> >  		return;         /* this can happen */
> >  
> > -	if (pm_runtime_suspended(dev))
> > +	/*
> > +	 * Check runtime status with pm_runtime_status_suspended(dev)
> > +	 * instead of pm_runtime_suspended(dev),
> > +	 * because device_shutdown() has disabled the device's runtime PM.
> > +	 */
> > +	if (pm_runtime_status_suspended(dev))
> >  		goto exit;
> >  
> >  	if (sdkp->WCE) {
> 
> This is no longer needed.  See commit
> fe6b91f47080eb17d21cbf2a39311877d57f6938 (PM / Driver core: leave
> runtime PM enabled during system shutdown).

I'll remove this patch.

Thanks.

> 
> Alan Stern
> 


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