linux-kernel - [RFC PATCH V2 12/13] ACPI: introduce dummy container scan handler

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Date:	Fri, 14 Mar 2014 00:16:52 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	bhelgaas@...gle.com, matthew.garrett@...ula.com,
	rafael.j.wysocki@...el.com, dmitry.torokhov@...il.com,
	Zhang Rui <rui.zhang@...el.com>
Subject: [RFC PATCH V2 12/13] ACPI: introduce dummy container scan handler

When CONFIG_ACPI_CONTAINER is cleared, platform devices would be
created for ACPI container objects.

Introduce a dummy container scan handler in this patch to prevent
these platform devices from being created.

Signed-off-by: Zhang Rui <rui.zhang@...el.com>
---
 drivers/acpi/Makefile    |    2 +-
 drivers/acpi/container.c |   21 +++++++++++++++++++++
 drivers/acpi/internal.h  |    4 ----
 3 files changed, 22 insertions(+), 5 deletions(-)

diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 2173e30..871d70d 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -63,7 +63,7 @@ obj-$(CONFIG_ACPI_FAN)		+= fan.o
 obj-$(CONFIG_ACPI_VIDEO)	+= video.o
 obj-$(CONFIG_ACPI_PCI_SLOT)	+= pci_slot.o
 obj-$(CONFIG_ACPI_PROCESSOR)	+= processor.o
-obj-$(CONFIG_ACPI_CONTAINER)	+= container.o
+obj-y				+= container.o
 obj-$(CONFIG_ACPI_THERMAL)	+= thermal.o
 obj-$(CONFIG_ACPI_HOTPLUG_MEMORY) += acpi_memhotplug.o
 obj-$(CONFIG_ACPI_BATTERY)	+= battery.o
diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c
index 368f9dd..c2ec401 100644
--- a/drivers/acpi/container.c
+++ b/drivers/acpi/container.c
@@ -43,6 +43,8 @@ static const struct acpi_device_id container_device_ids[] = {
 	{"", 0},
 };
 
+#ifdef CONFIG_ACPI_CONTAINER
+
 static int acpi_container_offline(struct container_dev *cdev)
 {
 	struct acpi_device *adev = ACPI_COMPANION(&cdev->dev);
@@ -110,3 +112,22 @@ void __init acpi_container_init(void)
 {
 	acpi_scan_add_handler_with_hotplug(&container_handler, "container");
 }
+
+#else
+
+static inline int container_device_attach(struct acpi_device *adev,
+			const struct acpi_device_id *not_used)
+{
+	return 1;
+}
+
+static struct acpi_scan_handler container_handler = {
+	.ids = container_device_ids,
+	.attach = container_device_attach,
+};
+
+void __init acpi_container_init(void)
+{
+	acpi_scan_add_handler(&container_handler);
+}
+#endif /* CONFIG_ACPI_CONTAINER */
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index a0c9368..253758a 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -32,11 +32,7 @@ void acpi_processor_init(void);
 void acpi_platform_init(void);
 void acpi_pnp_init(void);
 int acpi_sysfs_init(void);
-#ifdef CONFIG_ACPI_CONTAINER
 void acpi_container_init(void);
-#else
-static inline void acpi_container_init(void) {}
-#endif
 #ifdef CONFIG_ACPI_DOCK
 void acpi_dock_init(void);
 #else
-- 
1.7.9.5

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