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Merge branch 'pm-core'

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Merge a runtime PM framework cleanup and fix related to device links.

* pm-core:
  PM: runtime: Fix supplier device management during consumer probe
  PM: runtime: Redefine pm_runtime_release_supplier()
This commit is contained in:
Rafael J. Wysocki 2022-07-08 20:38:51 +02:00
commit fe7c758c07
3 changed files with 24 additions and 28 deletions
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13
drivers/base/core.c
View File

@ -486,7 +486,18 @@ static void device_link_release_fn(struct work_struct *work)
/* Ensure that all references to the link object have been dropped. */
device_link_synchronize_removal();
pm_runtime_release_supplier(link, true);
pm_runtime_release_supplier(link);
/*
* If supplier_preactivated is set, the link has been dropped between
* the pm_runtime_get_suppliers() and pm_runtime_put_suppliers() calls
* in __driver_probe_device(). In that case, drop the supplier's
* PM-runtime usage counter to remove the reference taken by
* pm_runtime_get_suppliers().
*/
if (link->supplier_preactivated)
pm_runtime_put_noidle(link->supplier);
pm_request_idle(link->supplier);
put_device(link->consumer);
put_device(link->supplier);

34
drivers/base/power/runtime.c
View File

@ -308,13 +308,10 @@ static int rpm_get_suppliers(struct device *dev)
/**
* pm_runtime_release_supplier - Drop references to device link's supplier.
* @link: Target device link.
* @check_idle: Whether or not to check if the supplier device is idle.
*
* Drop all runtime PM references associated with @link to its supplier device
* and if @check_idle is set, check if that device is idle (and so it can be
* suspended).
* Drop all runtime PM references associated with @link to its supplier device.
*/
void pm_runtime_release_supplier(struct device_link *link, bool check_idle)
void pm_runtime_release_supplier(struct device_link *link)
{
struct device *supplier = link->supplier;
@ -327,9 +324,6 @@ void pm_runtime_release_supplier(struct device_link *link, bool check_idle)
while (refcount_dec_not_one(&link->rpm_active) &&
atomic_read(&supplier->power.usage_count) > 0)
pm_runtime_put_noidle(supplier);
if (check_idle)
pm_request_idle(supplier);
}
static void __rpm_put_suppliers(struct device *dev, bool try_to_suspend)
@ -337,8 +331,11 @@ static void __rpm_put_suppliers(struct device *dev, bool try_to_suspend)
struct device_link *link;
list_for_each_entry_rcu(link, &dev->links.suppliers, c_node,
device_links_read_lock_held())
pm_runtime_release_supplier(link, try_to_suspend);
device_links_read_lock_held()) {
pm_runtime_release_supplier(link);
if (try_to_suspend)
pm_request_idle(link->supplier);
}
}
static void rpm_put_suppliers(struct device *dev)
@ -1771,7 +1768,6 @@ void pm_runtime_get_suppliers(struct device *dev)
if (link->flags & DL_FLAG_PM_RUNTIME) {
link->supplier_preactivated = true;
pm_runtime_get_sync(link->supplier);
refcount_inc(&link->rpm_active);
}
device_links_read_unlock(idx);
@ -1791,19 +1787,8 @@ void pm_runtime_put_suppliers(struct device *dev)
list_for_each_entry_rcu(link, &dev->links.suppliers, c_node,
device_links_read_lock_held())
if (link->supplier_preactivated) {
bool put;
link->supplier_preactivated = false;
spin_lock_irq(&dev->power.lock);
put = pm_runtime_status_suspended(dev) &&
refcount_dec_not_one(&link->rpm_active);
spin_unlock_irq(&dev->power.lock);
if (put)
pm_runtime_put(link->supplier);
pm_runtime_put(link->supplier);
}
device_links_read_unlock(idx);
@ -1838,7 +1823,8 @@ void pm_runtime_drop_link(struct device_link *link)
return;
pm_runtime_drop_link_count(link->consumer);
pm_runtime_release_supplier(link, true);
pm_runtime_release_supplier(link);
pm_request_idle(link->supplier);
}
static bool pm_runtime_need_not_resume(struct device *dev)

5
include/linux/pm_runtime.h
View File

@ -88,7 +88,7 @@ extern void pm_runtime_get_suppliers(struct device *dev);
extern void pm_runtime_put_suppliers(struct device *dev);
extern void pm_runtime_new_link(struct device *dev);
extern void pm_runtime_drop_link(struct device_link *link);
extern void pm_runtime_release_supplier(struct device_link *link, bool check_idle);
extern void pm_runtime_release_supplier(struct device_link *link);
extern int devm_pm_runtime_enable(struct device *dev);
@ -314,8 +314,7 @@ static inline void pm_runtime_get_suppliers(struct device *dev) {}
static inline void pm_runtime_put_suppliers(struct device *dev) {}
static inline void pm_runtime_new_link(struct device *dev) {}
static inline void pm_runtime_drop_link(struct device_link *link) {}
static inline void pm_runtime_release_supplier(struct device_link *link,
bool check_idle) {}
static inline void pm_runtime_release_supplier(struct device_link *link) {}
#endif /* !CONFIG_PM */