linux-kernel - Re: [PATCH 3/3] PM: Use pm_wakeup_pending() in device

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Date:	Fri, 3 Dec 2010 17:04:45 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] PM: Use pm_wakeup_pending() in device_suspend()

On Fri, 3 Dec 2010, Rafael J. Wysocki wrote:

> The devices will be suspended and the suspend will progress until it's
> finally aborted before putting the system into the sleep state.  But I agree
> it's better to check pm_wakeup_pending() in async_suspend() too,
> so I think we can simply put it into __device_suspend() instead, like in the
> patch below.
> 
> Thanks,
> Rafael
> 
> ---
> From: Rafael J. Wysocki <rjw@...k.pl>
> Subject: PM: Use pm_wakeup_pending() in __device_suspend()
> 
> Before starting to suspend a device in __device_suspend() check if
> there's a request to abort the power transition and return -EBUSY
> in that case.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> ---
>  drivers/base/power/main.c |    5 +++++
>  1 file changed, 5 insertions(+)
> 
> Index: linux-2.6/drivers/base/power/main.c
> ===================================================================
> --- linux-2.6.orig/drivers/base/power/main.c
> +++ linux-2.6/drivers/base/power/main.c
> @@ -877,6 +877,11 @@ static int __device_suspend(struct devic
>  	if (async_error)
>  		goto End;
>  
> +	if (pm_wakeup_pending()) {
> +		async_error = -EBUSY;
> +		goto End;
> +	}
> +
>  	if (dev->class) {
>  		if (dev->class->pm) {
>  			pm_dev_dbg(dev, state, "class ");
> 

Looks good.

Alan Stern

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