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

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Message-ID: <Pine.LNX.4.44L0.1012031024020.1682-100000@iolanthe.rowland.org>
Date:	Fri, 3 Dec 2010 10:26:10 -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:

> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> 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
> @@ -935,6 +935,11 @@ static void async_suspend(void *data, as
>  
>  static int device_suspend(struct device *dev)
>  {
> +	if (pm_wakeup_pending()) {
> +		async_error = -EBUSY;
> +		return async_error;
> +	}
> +
>  	INIT_COMPLETION(dev->power.completion);
>  
>  	if (pm_async_enabled && dev->power.async_suspend) {

Is a similar test needed in async_suspend()?  What happens if 
dpm_suspend() runs through the entire device list okay, but a wakeup 
event occurs in the middle of the async_synchronize_full() delay?

Alan Stern

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