PM: Add a switch for disabling/enabling asynchronous suspend/resume
Add sysfs attribute /sys/power/pm_async allowing the user space to
disable/enable asynchronous suspend/resume of devices.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 3b44c20..7e79201 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -201,7 +201,7 @@
if (!dev)
return;
- if (async || dev->power.async_suspend)
+ if (async || (pm_async_enabled && dev->power.async_suspend))
wait_for_completion(&dev->power.completion);
}
@@ -563,7 +563,8 @@
{
INIT_COMPLETION(dev->power.completion);
- if (dev->power.async_suspend && !pm_trace_is_enabled()) {
+ if (pm_async_enabled && dev->power.async_suspend
+ && !pm_trace_is_enabled()) {
get_device(dev);
async_schedule(async_resume, dev);
return 0;
@@ -867,7 +868,7 @@
{
INIT_COMPLETION(dev->power.completion);
- if (dev->power.async_suspend) {
+ if (pm_async_enabled && dev->power.async_suspend) {
get_device(dev);
async_schedule(async_suspend, dev);
return 0;
diff --git a/drivers/base/power/power.h b/drivers/base/power/power.h
index b8fa1aa..c0bd03c 100644
--- a/drivers/base/power/power.h
+++ b/drivers/base/power/power.h
@@ -12,10 +12,10 @@
#ifdef CONFIG_PM_SLEEP
-/*
- * main.c
- */
+/* kernel/power/main.c */
+extern int pm_async_enabled;
+/* drivers/base/power/main.c */
extern struct list_head dpm_list; /* The active device list */
static inline struct device *to_device(struct list_head *entry)