diff options
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/power/domain.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 5db704f02e71..c87588c21700 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -636,6 +636,18 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, atomic_read(&genpd->sd_count) > 0) return -EBUSY; + /* + * The children must be in their deepest (powered-off) states to allow + * the parent to be powered off. Note that, there's no need for + * additional locking, as powering on a child, requires the parent's + * lock to be acquired first. + */ + list_for_each_entry(link, &genpd->parent_links, parent_node) { + struct generic_pm_domain *child = link->child; + if (child->state_idx < child->state_count - 1) + return -EBUSY; + } + list_for_each_entry(pdd, &genpd->dev_list, list_node) { enum pm_qos_flags_status stat; @@ -1073,6 +1085,13 @@ static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock, || atomic_read(&genpd->sd_count) > 0) return; + /* Check that the children are in their deepest (powered-off) state. */ + list_for_each_entry(link, &genpd->parent_links, parent_node) { + struct generic_pm_domain *child = link->child; + if (child->state_idx < child->state_count - 1) + return; + } + /* Choose the deepest state when suspending */ genpd->state_idx = genpd->state_count - 1; if (_genpd_power_off(genpd, false)) |