linux-kernel - [PATCH 4/8] introduce device async suspend

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Date:	Wed, 15 Jul 2009 15:38:40 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-pm <linux-pm@...ts.linux-foundation.org>,
	linux-acpi <linux-acpi@...r.kernel.org>
Cc:	Len Brown <lenb@...nel.org>, Pavel Machek <pavel@...e.cz>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Van De Ven, Arjan" <arjan.van.de.ven@...el.com>,
	"Zhang, Rui" <rui.zhang@...el.com>
Subject: [PATCH 4/8] introduce device async suspend


introduce device async suspend.

If boot option "device_async_action" is added,
devices can be suspended asynchronously.

Signed-off-by: Zhang Rui <rui.zhang@...el.com>
---
 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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