diff options
Diffstat (limited to 'drivers/base/power/domain.c')
| -rw-r--r-- | drivers/base/power/domain.c | 46 |
1 files changed, 32 insertions, 14 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 2e2e6af1f3fe..da25c0630789 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -68,7 +68,36 @@ static struct generic_pm_domain *pm_genpd_lookup_name(const char *domain_name) return genpd; } -struct generic_pm_domain *dev_to_genpd(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. + */ +struct generic_pm_domain *pm_genpd_lookup_dev(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); + + return genpd; +} + +/* + * This should only be used where we are certain that the pm_domain + * attached to the device is a genpd domain. + */ +static struct generic_pm_domain *dev_to_genpd(struct device *dev) { if (IS_ERR_OR_NULL(dev->pm_domain)) return ERR_PTR(-EINVAL); @@ -2093,21 +2122,10 @@ EXPORT_SYMBOL_GPL(of_genpd_get_from_provider); */ static void genpd_dev_pm_detach(struct device *dev, bool power_off) { - struct generic_pm_domain *pd = NULL, *gpd; + struct generic_pm_domain *pd; int ret = 0; - if (!dev->pm_domain) - return; - - mutex_lock(&gpd_list_lock); - list_for_each_entry(gpd, &gpd_list, gpd_list_node) { - if (&gpd->domain == dev->pm_domain) { - pd = gpd; - break; - } - } - mutex_unlock(&gpd_list_lock); - + pd = pm_genpd_lookup_dev(dev); if (!pd) return; |