linux-kernel - Re: [PATCH 6/7] PM / Domains: Check device PM QoS flags in pm_genpd

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Date:	Tue, 9 Oct 2012 20:35:03 -0700
From:	mark gross <markgross@...gnar.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linux PM list <linux-pm@...r.kernel.org>,
	ACPI Devel Mailing List <linux-acpi@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Huang Ying <ying.huang@...el.com>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	Lan Tianyu <tianyu.lan@...el.com>,
	Aaron Lu <aaron.lu@...el.com>, Jean Pihet <j-pihet@...com>,
	linux-pci@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	mark gross <markgross@...gnar.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/7] PM / Domains: Check device PM QoS flags in
 pm_genpd_poweroff()

On Mon, Oct 08, 2012 at 10:08:39AM +0200, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Make the generic PM domains pm_genpd_poweroff() function take
> device PM QoS flags into account when deciding whether or not to
> remove power from the domain.
> 
> After this change the routine will return -EBUSY without executing
> the domain's .power_off() callback if there is at least one PM QoS
> flags request for at least one device in the domain and at least of
> those request has at least one of the NO_POWER_OFF and REMOTE_WAKEUP
> flags set.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Reviewed-by: Jean Pihet <j-pihet@...com>
> ---
>  drivers/base/power/domain.c |   11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> Index: linux/drivers/base/power/domain.c
> ===================================================================
> --- linux.orig/drivers/base/power/domain.c
> +++ linux/drivers/base/power/domain.c
> @@ -470,10 +470,19 @@ static int pm_genpd_poweroff(struct gene
>  		return -EBUSY;
>  
>  	not_suspended = 0;
> -	list_for_each_entry(pdd, &genpd->dev_list, list_node)
> +	list_for_each_entry(pdd, &genpd->dev_list, list_node) {
> +		enum pm_qos_flags_status stat;
> +
> +		stat = dev_pm_qos_flags(pdd->dev,
> +					PM_QOS_FLAG_NO_POWER_OFF
> +						| PM_QOS_FLAG_REMOTE_WAKEUP);
> +		if (stat > PM_QOS_FLAGS_NONE)
> +			return -EBUSY;
> +
>  		if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev)
>  		    || pdd->dev->power.irq_safe))
>  			not_suspended++;
> +	}
>  
>  	if (not_suspended > genpd->in_progress)
>  		return -EBUSY;
>
looks ok to me.
Reviewed-by: mark gross <markgross@...gnar.org>

--mrak
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