diff options
Diffstat (limited to 'drivers/base/power/runtime.c')
| -rw-r--r-- | drivers/base/power/runtime.c | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index af23eb327f57..6b8aa6bed064 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -1625,8 +1625,10 @@ void pm_runtime_get_suppliers(struct device *dev) idx = device_links_read_lock(); list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) - if (link->flags & DL_FLAG_PM_RUNTIME) + if (link->flags & DL_FLAG_PM_RUNTIME) { + refcount_inc(&link->rpm_active); pm_runtime_get_sync(link->supplier); + } device_links_read_unlock(idx); } @@ -1643,7 +1645,8 @@ void pm_runtime_put_suppliers(struct device *dev) idx = device_links_read_lock(); list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) - if (link->flags & DL_FLAG_PM_RUNTIME) + if (link->flags & DL_FLAG_PM_RUNTIME && + refcount_dec_not_one(&link->rpm_active)) pm_runtime_put(link->supplier); device_links_read_unlock(idx); @@ -1656,6 +1659,26 @@ void pm_runtime_new_link(struct device *dev) spin_unlock_irq(&dev->power.lock); } +/** + * pm_runtime_active_link - Set up new device link as active for PM-runtime. + * @link: Device link to be set up as active. + * @supplier: Supplier end of the link. + * + * Add 2 to the rpm_active refcount of @link and increment the PM-runtime + * usage counter of @supplier once more in case the link is being added while + * the consumer driver is probing and pm_runtime_put_suppliers() will be called + * subsequently. + * + * Note that this doesn't prevent rpm_put_suppliers() from decreasing the link's + * rpm_active refcount down to one, so runtime suspend of the consumer end of + * @link is not affected. + */ +void pm_runtime_active_link(struct device_link *link, struct device *supplier) +{ + refcount_add(2, &link->rpm_active); + pm_runtime_get_noresume(supplier); +} + void pm_runtime_drop_link(struct device *dev) { spin_lock_irq(&dev->power.lock); |