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Diffstat (limited to 'drivers/base/power')
-rw-r--r--drivers/base/power/main.c106
-rw-r--r--drivers/base/power/power.h23
-rw-r--r--drivers/base/power/sysfs.c2
3 files changed, 33 insertions, 98 deletions
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index d887d5cb5bef..c4568b82875b 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -50,26 +50,40 @@
LIST_HEAD(dpm_active);
static LIST_HEAD(dpm_off);
static LIST_HEAD(dpm_off_irq);
-static LIST_HEAD(dpm_destroy);
static DEFINE_MUTEX(dpm_list_mtx);
-static DECLARE_RWSEM(pm_sleep_rwsem);
-
-int (*platform_enable_wakeup)(struct device *dev, int is_on);
+/* 'true' if all devices have been suspended, protected by dpm_list_mtx */
+static bool all_sleeping;
/**
* device_pm_add - add a device to the list of active devices
* @dev: Device to be added to the list
*/
-void device_pm_add(struct device *dev)
+int device_pm_add(struct device *dev)
{
+ int error = 0;
+
pr_debug("PM: Adding info for %s:%s\n",
dev->bus ? dev->bus->name : "No Bus",
kobject_name(&dev->kobj));
mutex_lock(&dpm_list_mtx);
- list_add_tail(&dev->power.entry, &dpm_active);
+ if ((dev->parent && dev->parent->power.sleeping) || all_sleeping) {
+ if (dev->parent->power.sleeping)
+ dev_warn(dev,
+ "parent %s is sleeping, will not add\n",
+ dev->parent->bus_id);
+ else
+ dev_warn(dev, "devices are sleeping, will not add\n");
+ WARN_ON(true);
+ error = -EBUSY;
+ } else {
+ error = dpm_sysfs_add(dev);
+ if (!error)
+ list_add_tail(&dev->power.entry, &dpm_active);
+ }
mutex_unlock(&dpm_list_mtx);
+ return error;
}
/**
@@ -89,50 +103,6 @@ void device_pm_remove(struct device *dev)
mutex_unlock(&dpm_list_mtx);
}
-/**
- * device_pm_schedule_removal - schedule the removal of a suspended device
- * @dev: Device to destroy
- *
- * Moves the device to the dpm_destroy list for further processing by
- * unregister_dropped_devices().
- */
-void device_pm_schedule_removal(struct device *dev)
-{
- pr_debug("PM: Preparing for removal: %s:%s\n",
- dev->bus ? dev->bus->name : "No Bus",
- kobject_name(&dev->kobj));
- mutex_lock(&dpm_list_mtx);
- list_move_tail(&dev->power.entry, &dpm_destroy);
- mutex_unlock(&dpm_list_mtx);
-}
-EXPORT_SYMBOL_GPL(device_pm_schedule_removal);
-
-/**
- * pm_sleep_lock - mutual exclusion for registration and suspend
- *
- * Returns 0 if no suspend is underway and device registration
- * may proceed, otherwise -EBUSY.
- */
-int pm_sleep_lock(void)
-{
- if (down_read_trylock(&pm_sleep_rwsem))
- return 0;
-
- return -EBUSY;
-}
-
-/**
- * pm_sleep_unlock - mutual exclusion for registration and suspend
- *
- * This routine undoes the effect of device_pm_add_lock
- * when a device's registration is complete.
- */
-void pm_sleep_unlock(void)
-{
- up_read(&pm_sleep_rwsem);
-}
-
-
/*------------------------- Resume routines -------------------------*/
/**
@@ -242,11 +212,13 @@ static int resume_device(struct device *dev)
static void dpm_resume(void)
{
mutex_lock(&dpm_list_mtx);
+ all_sleeping = false;
while(!list_empty(&dpm_off)) {
struct list_head *entry = dpm_off.next;
struct device *dev = to_device(entry);
list_move_tail(entry, &dpm_active);
+ dev->power.sleeping = false;
mutex_unlock(&dpm_list_mtx);
resume_device(dev);
mutex_lock(&dpm_list_mtx);
@@ -255,26 +227,6 @@ static void dpm_resume(void)
}
/**
- * unregister_dropped_devices - Unregister devices scheduled for removal
- *
- * Unregister all devices on the dpm_destroy list.
- */
-static void unregister_dropped_devices(void)
-{
- mutex_lock(&dpm_list_mtx);
- while (!list_empty(&dpm_destroy)) {
- struct list_head *entry = dpm_destroy.next;
- struct device *dev = to_device(entry);
-
- mutex_unlock(&dpm_list_mtx);
- /* This also removes the device from the list */
- device_unregister(dev);
- mutex_lock(&dpm_list_mtx);
- }
- mutex_unlock(&dpm_list_mtx);
-}
-
-/**
* device_resume - Restore state of each device in system.
*
* Resume all the devices, unlock them all, and allow new
@@ -284,8 +236,6 @@ void device_resume(void)
{
might_sleep();
dpm_resume();
- unregister_dropped_devices();
- up_write(&pm_sleep_rwsem);
}
EXPORT_SYMBOL_GPL(device_resume);
@@ -377,11 +327,6 @@ static int suspend_device(struct device *dev, pm_message_t state)
down(&dev->sem);
- if (dev->power.power_state.event) {
- dev_dbg(dev, "PM: suspend %d-->%d\n",
- dev->power.power_state.event, state.event);
- }
-
if (dev->class && dev->class->suspend) {
suspend_device_dbg(dev, state, "class ");
error = dev->class->suspend(dev, state);
@@ -426,6 +371,9 @@ static int dpm_suspend(pm_message_t state)
struct list_head *entry = dpm_active.prev;
struct device *dev = to_device(entry);
+ WARN_ON(dev->parent && dev->parent->power.sleeping);
+
+ dev->power.sleeping = true;
mutex_unlock(&dpm_list_mtx);
error = suspend_device(dev, state);
mutex_lock(&dpm_list_mtx);
@@ -437,11 +385,14 @@ static int dpm_suspend(pm_message_t state)
(error == -EAGAIN ?
" (please convert to suspend_late)" :
""));
+ dev->power.sleeping = false;
break;
}
if (!list_empty(&dev->power.entry))
list_move(&dev->power.entry, &dpm_off);
}
+ if (!error)
+ all_sleeping = true;
mutex_unlock(&dpm_list_mtx);
return error;
@@ -459,7 +410,6 @@ int device_suspend(pm_message_t state)
int error;
might_sleep();
- down_write(&pm_sleep_rwsem);
error = dpm_suspend(state);
if (error)
device_resume();
diff --git a/drivers/base/power/power.h b/drivers/base/power/power.h
index e32d3bdb92c1..a6894f2a4b99 100644
--- a/drivers/base/power/power.h
+++ b/drivers/base/power/power.h
@@ -11,30 +11,13 @@ static inline struct device *to_device(struct list_head *entry)
return container_of(entry, struct device, power.entry);
}
-extern void device_pm_add(struct device *);
+extern int device_pm_add(struct device *);
extern void device_pm_remove(struct device *);
-extern int pm_sleep_lock(void);
-extern void pm_sleep_unlock(void);
#else /* CONFIG_PM_SLEEP */
-
-static inline void device_pm_add(struct device *dev)
-{
-}
-
-static inline void device_pm_remove(struct device *dev)
-{
-}
-
-static inline int pm_sleep_lock(void)
-{
- return 0;
-}
-
-static inline void pm_sleep_unlock(void)
-{
-}
+static inline int device_pm_add(struct device *dev) { return 0; }
+static inline void device_pm_remove(struct device *dev) {}
#endif
diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c
index f2ed179cd695..d11f74b038db 100644
--- a/drivers/base/power/sysfs.c
+++ b/drivers/base/power/sysfs.c
@@ -6,6 +6,8 @@
#include <linux/string.h>
#include "power.h"
+int (*platform_enable_wakeup)(struct device *dev, int is_on);
+
/*
* wakeup - Report/change current wakeup option for device
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-14 02:55:23 +0000