introduce device async suspend.
If boot option "device_async_action" is added,
devices can be suspended asynchronously.
Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
---
drivers/base/power/main.c | 6 +++++-
include/linux/async_dev.h | 3 ++-
drivers/base/async_dev.c | 13 ++++++++++++-
3 files changed, 19 insertions(+), 3 deletions(-)
Index: linux-2.6/drivers/base/power/main.c
===================================================================
--- linux-2.6.orig/drivers/base/power/main.c
+++ linux-2.6/drivers/base/power/main.c
@@ -24,6 +24,7 @@
#include <linux/resume-trace.h>
#include <linux/rwsem.h>
#include <linux/interrupt.h>
+#include <linux/async_dev.h>
#include "../base.h"
#include "power.h"
@@ -678,7 +679,8 @@ static int dpm_suspend(pm_message_t stat
get_device(dev);
mutex_unlock(&dpm_list_mtx);
- error = device_suspend(dev, state);
+ error = dev_async_schedule(dev, device_suspend, &state,
+ DEV_ASYNC_SUSPEND);
mutex_lock(&dpm_list_mtx);
if (error) {
@@ -693,6 +695,8 @@ static int dpm_suspend(pm_message_t stat
}
list_splice(&list, dpm_list.prev);
mutex_unlock(&dpm_list_mtx);
+
+ dev_async_synchronization();
return error;
}
Index: linux-2.6/drivers/base/async_dev.c
===================================================================
--- linux-2.6.orig/drivers/base/async_dev.c
+++ linux-2.6/drivers/base/async_dev.c
@@ -17,6 +17,8 @@
static LIST_HEAD(dev_async_list);
static int dev_async_enabled;
+typedef int (*dev_async_suspend)(struct device *, pm_message_t);
+
struct dev_async_context {
struct device *dev;
void *data;
@@ -27,10 +29,19 @@ struct dev_async_context {
static int dev_action(struct device *dev, void *func,
void *data, int type)
{
+ int error = 0;
+
if (!func)
return -EINVAL;
- return 0;
+ switch (type) {
+ case DEV_ASYNC_SUSPEND:
+ error = ((dev_async_suspend)func)(dev, *((pm_message_t *)data));
+ break;
+ default:
+ return -EINVAL;
+ }
+ return error;
}
static void dev_async_action(void *data, async_cookie_t cookie)
Index: linux-2.6/include/linux/async_dev.h
===================================================================
--- linux-2.6.orig/include/linux/async_dev.h
+++ linux-2.6/include/linux/async_dev.h
@@ -28,7 +28,8 @@ struct dev_async_struct {
async_cookie_t cookie;
};
-#define DEV_ASYNC_ACTIONS_ALL 0
+#define DEV_ASYNC_SUSPEND 1
+#define DEV_ASYNC_ACTIONS_ALL DEV_ASYNC_SUSPEND
extern int dev_async_schedule(struct device *, void *,
void *, int);
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