PM / Domains: Rename is_async to one_dev_on for genpd_power_off()

The parameter name is_async, for genpd_power_off() gives a poor description
of its purpose. To clarify, let's rename it to one_dev_on and update the
documentation of it in the function header.
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/base/power/domain.c

@@ -276,12 +276,15 @@ static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
 /**
  * genpd_power_off - Remove power from a given PM domain.
  * @genpd: PM domain to power down.
- * @is_async: PM domain is powered down from a scheduled work
+ * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the
+ * RPM status of the releated device is in an intermediate state, not yet turned
+ * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not
+ * be RPM_SUSPENDED, while it tries to power off the PM domain.
  *
  * If all of the @genpd's devices have been suspended and all of its subdomains
  * have been powered down, remove power from @genpd.
  */
-static int genpd_power_off(struct generic_pm_domain *genpd, bool is_async)
+static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on)
 {
 	struct pm_domain_data *pdd;
 	struct gpd_link *link;
@@ -317,7 +320,7 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool is_async)
 			not_suspended++;
 	}
 
-	if (not_suspended > 1 || (not_suspended == 1 && is_async))
+	if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on))
 		return -EBUSY;
 
 	if (genpd->gov && genpd->gov->power_down_ok) {
@@ -459,7 +462,7 @@ static void genpd_power_off_work_fn(struct work_struct *work)
 	genpd = container_of(work, struct generic_pm_domain, power_off_work);
 
 	genpd_lock(genpd);
-	genpd_power_off(genpd, true);
+	genpd_power_off(genpd, false);
 	genpd_unlock(genpd);
 }
 
@@ -578,7 +581,7 @@ static int genpd_runtime_suspend(struct device *dev)
 		return 0;
 
 	genpd_lock(genpd);
-	genpd_power_off(genpd, false);
+	genpd_power_off(genpd, true);
 	genpd_unlock(genpd);
 
 	return 0;
@@ -658,7 +661,7 @@ static int genpd_runtime_resume(struct device *dev)
 	if (!pm_runtime_is_irq_safe(dev) ||
 		(pm_runtime_is_irq_safe(dev) && genpd_is_irq_safe(genpd))) {
 		genpd_lock(genpd);
-		genpd_power_off(genpd, 0);
+		genpd_power_off(genpd, true);
 		genpd_unlock(genpd);
 	}