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

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Message-ID: <Pine.LNX.4.44L0.1112141146230.1707-100000@iolanthe.rowland.org>
Date:	Wed, 14 Dec 2011 11:49:57 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Lin Ming <ming.m.lin@...el.com>
cc:	Jeff Garzik <jgarzik@...ox.com>,
	James Bottomley <JBottomley@...allels.com>,
	Tejun Heo <tj@...nel.org>, <linux-kernel@...r.kernel.org>,
	<linux-ide@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
	<linux-pm@...r.kernel.org>
Subject: Re: [PATCH 1/3] [SCSI] sd: fix runtime status check in sd_shutdown

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).

Alan Stern

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