Re: [PATCH 6/7] PM / Domains: Check device PM QoS flags in pm_genpd_poweroff()

mark gross
2012-10-10T03:35:09Z

On Mon, Oct 08, 2012 at 10:08:39AM +0200, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.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@intel.com>
> Reviewed-by: Jean Pihet <j-pihet@ti.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@thegnar.org>

--mrak