PM / Domains: Simplify detaching a device from its genpd

There's no need to validate the PM domain by using genpd_lookup_dev() when
removing the device via genpd's genpd_dev_pm_detach() function. That's
because this function can't be called, unless there is a valid PM domain
for the device.

To simplify the behaviour, let's move code from pm_genpd_remove_device()
into a new internal function, genpd_remove_device(), which is called from
pm_genpd_remove_device() and genpd_dev_pm_detach().

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Lina Iyer <lina.iyer@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 83ae3d7d3fdd70359dbbb355849be8b04a28ba45..63f0f8b3f324064afcc9682f83e854d180069a8e 100644 (file)
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -1121,13 +1121,8 @@ int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
 }
 EXPORT_SYMBOL_GPL(__pm_genpd_add_device);
 
-/**
- * pm_genpd_remove_device - Remove a device from an I/O PM domain.
- * @genpd: PM domain to remove the device from.
- * @dev: Device to be removed.
- */
-int pm_genpd_remove_device(struct generic_pm_domain *genpd,
-                          struct device *dev)
+static int genpd_remove_device(struct generic_pm_domain *genpd,
+                              struct device *dev)
 {
        struct generic_pm_domain_data *gpd_data;
        struct pm_domain_data *pdd;
@@ -1135,10 +1130,6 @@ int pm_genpd_remove_device(struct generic_pm_domain *genpd,
 
        dev_dbg(dev, "%s()\n", __func__);
 
-       if (!genpd || genpd != genpd_lookup_dev(dev))
-               return -EINVAL;
-
-       /* The above validation also means we have existing domain_data. */
        pdd = dev->power.subsys_data->domain_data;
        gpd_data = to_gpd_data(pdd);
        dev_pm_qos_remove_notifier(dev, &gpd_data->nb);
@@ -1170,6 +1161,20 @@ int pm_genpd_remove_device(struct generic_pm_domain *genpd,
 
        return ret;
 }
+
+/**
+ * pm_genpd_remove_device - Remove a device from an I/O PM domain.
+ * @genpd: PM domain to remove the device from.
+ * @dev: Device to be removed.
+ */
+int pm_genpd_remove_device(struct generic_pm_domain *genpd,
+                          struct device *dev)
+{
+       if (!genpd || genpd != genpd_lookup_dev(dev))
+               return -EINVAL;
+
+       return genpd_remove_device(genpd, dev);
+}
 EXPORT_SYMBOL_GPL(pm_genpd_remove_device);
 
 static int genpd_add_subdomain(struct generic_pm_domain *genpd,
@@ -1797,14 +1802,14 @@ static void genpd_dev_pm_detach(struct device *dev, bool power_off)
        unsigned int i;
        int ret = 0;
 
-       pd = genpd_lookup_dev(dev);
-       if (!pd)
+       pd = dev_to_genpd(dev);
+       if (IS_ERR(pd))
                return;
 
        dev_dbg(dev, "removing from PM domain %s\n", pd->name);
 
        for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) {
-               ret = pm_genpd_remove_device(pd, dev);
+               ret = genpd_remove_device(pd, dev);
                if (ret != -EAGAIN)
                        break;