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PM / Domains: Simplify genpd_lookup_dev()

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genpd_lookup_dev(), is a bit unnecessary heavy, as it walks the gpd_list to
try to find a valid PM domain corresponding to the device's attached genpd.

Instead of walking the gpd_list, let's use the fact that a genpd always has
the ->runtime_suspend() callback assigned to the genpd_runtime_suspend()
function.

While changing this, let's take the opportunity to also rename
genpd_lookup_dev(), into dev_to_genpd_safe() to better reflect its purpose.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Ulf Hansson 2019-08-29 16:48:05 +02:00 committed by Rafael J. Wysocki
parent 0d1e16c640
commit b3ad17c098
1 changed files with 8 additions and 13 deletions
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21
drivers/base/power/domain.c
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@ -149,29 +149,24 @@ static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev,
return ret;
}
static int genpd_runtime_suspend(struct device *dev);
/*
* Get the generic PM domain for a particular struct device.
* This validates the struct device pointer, the PM domain pointer,
* and checks that the PM domain pointer is a real generic PM domain.
* Any failure results in NULL being returned.
*/
static struct generic_pm_domain *genpd_lookup_dev(struct device *dev)
static struct generic_pm_domain *dev_to_genpd_safe(struct device *dev)
{
struct generic_pm_domain *genpd = NULL, *gpd;
if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain))
return NULL;
mutex_lock(&gpd_list_lock);
list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
if (&gpd->domain == dev->pm_domain) {
genpd = gpd;
break;
}
}
mutex_unlock(&gpd_list_lock);
/* A genpd's always have its ->runtime_suspend() callback assigned. */
if (dev->pm_domain->ops.runtime_suspend == genpd_runtime_suspend)
return pd_to_genpd(dev->pm_domain);
return genpd;
return NULL;
}
/*
@ -1610,7 +1605,7 @@ static int genpd_remove_device(struct generic_pm_domain *genpd,
*/
int pm_genpd_remove_device(struct device *dev)
{
struct generic_pm_domain *genpd = genpd_lookup_dev(dev);
struct generic_pm_domain *genpd = dev_to_genpd_safe(dev);
if (!genpd)
return -EINVAL;