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-rw-r--r--drivers/base/dd.c3
-rw-r--r--drivers/base/power/common.c3
-rw-r--r--drivers/base/power/domain.c2
-rw-r--r--drivers/base/power/main.c35
-rw-r--r--drivers/base/power/power.h3
-rw-r--r--include/linux/pm.h1
6 files changed, 47 insertions, 0 deletions
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 13a0d66e5782..049942176b00 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -250,6 +250,8 @@ static void driver_bound(struct device *dev)
klist_add_tail(&dev->p->knode_driver, &dev->driver->p->klist_devices);
+ device_pm_check_callbacks(dev);
+
/*
* Make sure the device is no longer in one of the deferred lists and
* kick off retrying all pending devices
@@ -766,6 +768,7 @@ static void __device_release_driver(struct device *dev)
pm_runtime_reinit(dev);
klist_remove(&dev->p->knode_driver);
+ device_pm_check_callbacks(dev);
if (dev->bus)
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
BUS_NOTIFY_UNBOUND_DRIVER,
diff --git a/drivers/base/power/common.c b/drivers/base/power/common.c
index 02812bcabcac..93ed14cc2252 100644
--- a/drivers/base/power/common.c
+++ b/drivers/base/power/common.c
@@ -14,6 +14,8 @@
#include <linux/acpi.h>
#include <linux/pm_domain.h>
+#include "power.h"
+
/**
* dev_pm_get_subsys_data - Create or refcount power.subsys_data for device.
* @dev: Device to handle.
@@ -147,5 +149,6 @@ void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd)
WARN(device_is_bound(dev),
"PM domains can only be changed for unbound devices\n");
dev->pm_domain = pd;
+ device_pm_check_callbacks(dev);
}
EXPORT_SYMBOL_GPL(dev_pm_domain_set);
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index abbac6fe8fd5..33a5f4b752ed 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -20,6 +20,8 @@
#include <linux/suspend.h>
#include <linux/export.h>
+#include "power.h"
+
#define GENPD_RETRY_MAX_MS 250 /* Approximate */
#define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 9d626ac08d9c..6e7c3ccea24b 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -125,6 +125,7 @@ void device_pm_add(struct device *dev)
{
pr_debug("PM: Adding info for %s:%s\n",
dev->bus ? dev->bus->name : "No Bus", dev_name(dev));
+ device_pm_check_callbacks(dev);
mutex_lock(&dpm_list_mtx);
if (dev->parent && dev->parent->power.is_prepared)
dev_warn(dev, "parent %s should not be sleeping\n",
@@ -147,6 +148,7 @@ void device_pm_remove(struct device *dev)
mutex_unlock(&dpm_list_mtx);
device_wakeup_disable(dev);
pm_runtime_remove(dev);
+ device_pm_check_callbacks(dev);
}
/**
@@ -1572,6 +1574,11 @@ static int device_prepare(struct device *dev, pm_message_t state)
dev->power.wakeup_path = device_may_wakeup(dev);
+ if (dev->power.no_pm_callbacks) {
+ ret = 1; /* Let device go direct_complete */
+ goto unlock;
+ }
+
if (dev->pm_domain) {
info = "preparing power domain ";
callback = dev->pm_domain->ops.prepare;
@@ -1594,6 +1601,7 @@ static int device_prepare(struct device *dev, pm_message_t state)
if (callback)
ret = callback(dev);
+unlock:
device_unlock(dev);
if (ret < 0) {
@@ -1736,3 +1744,30 @@ void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *))
device_pm_unlock();
}
EXPORT_SYMBOL_GPL(dpm_for_each_dev);
+
+static bool pm_ops_is_empty(const struct dev_pm_ops *ops)
+{
+ if (!ops)
+ return true;
+
+ return !ops->prepare &&
+ !ops->suspend &&
+ !ops->suspend_late &&
+ !ops->suspend_noirq &&
+ !ops->resume_noirq &&
+ !ops->resume_early &&
+ !ops->resume &&
+ !ops->complete;
+}
+
+void device_pm_check_callbacks(struct device *dev)
+{
+ spin_lock_irq(&dev->power.lock);
+ dev->power.no_pm_callbacks =
+ (!dev->bus || pm_ops_is_empty(dev->bus->pm)) &&
+ (!dev->class || pm_ops_is_empty(dev->class->pm)) &&
+ (!dev->type || pm_ops_is_empty(dev->type->pm)) &&
+ (!dev->pm_domain || pm_ops_is_empty(&dev->pm_domain->ops)) &&
+ (!dev->driver || pm_ops_is_empty(dev->driver->pm));
+ spin_unlock_irq(&dev->power.lock);
+}
diff --git a/drivers/base/power/power.h b/drivers/base/power/power.h
index 8b06193d4a5e..50e30e7b059d 100644
--- a/drivers/base/power/power.h
+++ b/drivers/base/power/power.h
@@ -125,6 +125,7 @@ extern void device_pm_remove(struct device *);
extern void device_pm_move_before(struct device *, struct device *);
extern void device_pm_move_after(struct device *, struct device *);
extern void device_pm_move_last(struct device *);
+extern void device_pm_check_callbacks(struct device *dev);
#else /* !CONFIG_PM_SLEEP */
@@ -143,6 +144,8 @@ static inline void device_pm_move_after(struct device *deva,
struct device *devb) {}
static inline void device_pm_move_last(struct device *dev) {}
+static inline void device_pm_check_callbacks(struct device *dev) {}
+
#endif /* !CONFIG_PM_SLEEP */
static inline void device_pm_init(struct device *dev)
diff --git a/include/linux/pm.h b/include/linux/pm.h
index 528be6787796..6a5d654f4447 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -573,6 +573,7 @@ struct dev_pm_info {
struct wakeup_source *wakeup;
bool wakeup_path:1;
bool syscore:1;
+ bool no_pm_callbacks:1; /* Owned by the PM core */
#else
unsigned int should_wakeup:1;
#endif