introduce device async shutdown.
If boot option "dev_async_action" is added,
devices can be shutdown asynchronously.
Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
---
drivers/base/core.c | 7 +++++--
include/linux/async_dev.h | 4 +++-
drivers/base/async_dev.c | 4 ++++
3 files changed, 12 insertions(+), 3 deletions(-)
Index: linux-2.6/drivers/base/core.c
===================================================================
--- linux-2.6.orig/drivers/base/core.c
+++ linux-2.6/drivers/base/core.c
@@ -1715,14 +1715,17 @@ void device_shutdown(void)
kobj.entry) {
if (dev->bus && dev->bus->shutdown) {
dev_dbg(dev, "shutdown\n");
- dev->bus->shutdown(dev);
+ dev_async_schedule(dev, dev->bus->shutdown, NULL,
+ DEV_ASYNC_SHUTDOWN);
} else if (dev->driver && dev->driver->shutdown) {
dev_dbg(dev, "shutdown\n");
- dev->driver->shutdown(dev);
+ dev_async_schedule(dev, dev->driver->shutdown, NULL,
+ DEV_ASYNC_SHUTDOWN);
}
}
kobject_put(sysfs_dev_char_kobj);
kobject_put(sysfs_dev_block_kobj);
kobject_put(dev_kobj);
+ dev_async_synchronization();
async_synchronize_full();
}
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
@@ -30,8 +30,10 @@ struct dev_async_struct {
#define DEV_ASYNC_SUSPEND 1
#define DEV_ASYNC_RESUME 2
+#define DEV_ASYNC_SHUTDOWN 4
#define DEV_ASYNC_ACTIONS_ALL (DEV_ASYNC_SUSPEND | \
- DEV_ASYNC_RESUME)
+ DEV_ASYNC_RESUME | \
+ DEV_ASYNC_SHUTDOWN)
extern int dev_async_schedule(struct device *, void *,
void *, int);
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
@@ -18,6 +18,7 @@ static LIST_HEAD(dev_async_list);
static int dev_async_enabled;
typedef int (*dev_async_suspend)(struct device *, pm_message_t);
+typedef void (*dev_async_shutdown) (struct device *);
struct dev_async_context {
struct device *dev;
@@ -39,6 +40,9 @@ static int dev_action(struct device *dev
case DEV_ASYNC_RESUME:
error = ((dev_async_suspend)func)(dev, *((pm_message_t *)data));
break;
+ case DEV_ASYNC_SHUTDOWN:
+ ((dev_async_shutdown)func)(dev);
+ break;
default:
return -EINVAL;
}
--
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