[Patch v1 1/3] ACPI: add callback prepare() into acpi_hotplug_handler

From: Jiang Liu
Date: Fri Jan 17 2014 - 21:48:18 EST

Add callback prepare() into acpi_hotplug_handler, which will get called
at the very beginning of ACPI hotplug event handler. The ACPI core will
ignore the event if prepare() returns NOTIFY_STOP.

Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
drivers/acpi/scan.c | 4 ++++
include/acpi/acpi_bus.h | 1 +
2 files changed, 5 insertions(+)

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index fd39459..6b0f419 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -392,6 +392,10 @@ static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
struct acpi_device *adev;
acpi_status status;

+ if (handler->prepare &&
+ handler->prepare(handle, type, data) == NOTIFY_STOP)
+ return;
if (!handler->hotplug.enabled)
return acpi_hotplug_unsupported(handle, type);

diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index ddabed1..09a73bd 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -113,6 +113,7 @@ static inline struct acpi_hotplug_profile *to_acpi_hotplug_profile(
struct acpi_scan_handler {
const struct acpi_device_id *ids;
struct list_head list_node;
+ int (*prepare)(acpi_handle handle, u32 type, void *context);
int (*attach)(struct acpi_device *dev, const struct acpi_device_id *id);
void (*detach)(struct acpi_device *dev);
struct acpi_hotplug_profile hotplug;

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