linux-kernel - Re: [PATCH 1/3] PM / Runtime: Fix rpm_resume() return value for power.no

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Date:	Wed, 15 Aug 2012 12:14:52 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Linux PM list <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] PM / Runtime: Fix rpm_resume() return value for
 power.no_callbacks set

On Tue, 14 Aug 2012, Rafael J. Wysocki wrote:

> 
> For devices whose power.no_callbacks flag is set, rpm_resume()
> should return 1 if the device's parent is already active, so that
> the callers of pm_runtime_get() don't think that they have to wait
> for the device to resume (asynchronously) in that case (the core
> won't queue up an asynchronous resume in that case, so there's
> nothing to wait for anyway).
> 
> Modify the code accordingly (and make sure that an idle notification
> will be queued up on success, even if 1 is to be returned).
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> ---
>  drivers/base/power/runtime.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> Index: linux/drivers/base/power/runtime.c
> ===================================================================
> --- linux.orig/drivers/base/power/runtime.c
> +++ linux/drivers/base/power/runtime.c
> @@ -584,6 +584,7 @@ static int rpm_resume(struct device *dev
>  		    || dev->parent->power.runtime_status == RPM_ACTIVE) {
>  			atomic_inc(&dev->parent->power.child_count);
>  			spin_unlock(&dev->parent->power.lock);
> +			retval = 1;
>  			goto no_callback;	/* Assume success. */
>  		}
>  		spin_unlock(&dev->parent->power.lock);
> @@ -664,7 +665,7 @@ static int rpm_resume(struct device *dev
>  	}
>  	wake_up_all(&dev->power.wait_queue);
>  
> -	if (!retval)
> +	if (retval >= 0)
>  		rpm_idle(dev, RPM_ASYNC);
>  
>   out:

Acked-by: Alan Stern <stern@...land.harvard.edu>

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