From 02f57c67a8677ae55dcdd256a2a7abaf41e4cc1f Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Fri, 21 Dec 2012 00:36:46 +0100
Subject: ACPI: Remove acpi_start_single_object() and acpi_bus_start()

The ACPI PCI root bridge driver was the only ACPI driver implementing
the .start() callback, which isn't used by any ACPI drivers any more
now.

For this reason, acpi_start_single_object() has no purpose any more,
so remove it and all references to it.  Also remove
acpi_bus_start_device(), whose only purpose was to call
acpi_start_single_object().

Moreover, since after the removal of acpi_bus_start_device() the
only purpose of acpi_bus_start() remains to call
acpi_update_all_gpes(), move that into acpi_bus_add() and drop
acpi_bus_start() too, remove its header from acpi_bus.h and
update all of its former users accordingly.

This change was previously proposed in a different from by
Yinghai Lu.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Acked-by: Toshi Kani <toshi.kani@hp.com>
---
 drivers/pci/hotplug/acpiphp_glue.c | 4 +---
 drivers/pci/hotplug/sgi_hotplug.c  | 2 --
 2 files changed, 1 insertion(+), 5 deletions(-)

(limited to 'drivers/pci/hotplug')

diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index 3d6d4fd1e3c5..7e2bad4c2fcc 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -759,7 +759,6 @@ static int acpiphp_bus_add(struct acpiphp_func *func)
 			-ret_val);
 		goto acpiphp_bus_add_out;
 	}
-	ret_val = acpi_bus_start(device);
 
 acpiphp_bus_add_out:
 	return ret_val;
@@ -1148,8 +1147,7 @@ static void handle_bridge_insertion(acpi_handle handle, u32 type)
 		err("cannot add bridge to acpi list\n");
 		return;
 	}
-	if (!acpiphp_configure_bridge(handle) &&
-		!acpi_bus_start(device))
+	if (!acpiphp_configure_bridge(handle))
 		add_bridge(handle);
 	else
 		err("cannot configure and start bridge\n");
diff --git a/drivers/pci/hotplug/sgi_hotplug.c b/drivers/pci/hotplug/sgi_hotplug.c
index f64ca92253da..20c960d5317d 100644
--- a/drivers/pci/hotplug/sgi_hotplug.c
+++ b/drivers/pci/hotplug/sgi_hotplug.c
@@ -457,8 +457,6 @@ static int enable_slot(struct hotplug_slot *bss_hotplug_slot)
 					       ret, (int)(adr>>16),
 					       (int)(adr&0xffff));
 					/* try to continue on */
-				} else {
-					acpi_bus_start(device);
 				}
 			}
 		}
-- 
cgit v1.2.3


From 636458de36f1fb4cdd318387d2f45604e451b17a Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Fri, 21 Dec 2012 00:36:47 +0100
Subject: ACPI: Remove the arguments of acpi_bus_add() that are not used

Notice that acpi_bus_add() uses only 2 of its 4 arguments and
redefine its header to match the body.  Update all of its callers as
necessary and observe that this leads to quite a number of removed
lines of code (Linus will like that).

Add a kerneldoc comment documenting acpi_bus_add() and wonder how
its callers make wrong assumptions about the second argument (make
note to self to take care of that later).

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Acked-by: Toshi Kani <toshi.kani@hp.com>
---
 drivers/acpi/acpi_memhotplug.c     | 19 +------------------
 drivers/acpi/container.c           | 16 +---------------
 drivers/acpi/dock.c                | 13 ++-----------
 drivers/acpi/processor_driver.c    | 24 +-----------------------
 drivers/acpi/scan.c                | 34 +++++++++++++++++++++-------------
 drivers/pci/hotplug/acpiphp_glue.c | 21 ++++-----------------
 drivers/pci/hotplug/sgi_hotplug.c  |  3 +--
 include/acpi/acpi_bus.h            |  3 +--
 8 files changed, 32 insertions(+), 101 deletions(-)

(limited to 'drivers/pci/hotplug')

diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index eb30e5ab4cab..d0a7da704d49 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -157,34 +157,17 @@ static int
 acpi_memory_get_device(acpi_handle handle,
 		       struct acpi_memory_device **mem_device)
 {
-	acpi_status status;
-	acpi_handle phandle;
 	struct acpi_device *device = NULL;
-	struct acpi_device *pdevice = NULL;
 	int result;
 
-
 	if (!acpi_bus_get_device(handle, &device) && device)
 		goto end;
 
-	status = acpi_get_parent(handle, &phandle);
-	if (ACPI_FAILURE(status)) {
-		ACPI_EXCEPTION((AE_INFO, status, "Cannot find acpi parent"));
-		return -EINVAL;
-	}
-
-	/* Get the parent device */
-	result = acpi_bus_get_device(phandle, &pdevice);
-	if (result) {
-		acpi_handle_warn(phandle, "Cannot get acpi bus device\n");
-		return -EINVAL;
-	}
-
 	/*
 	 * Now add the notified device.  This creates the acpi_device
 	 * and invokes .add function
 	 */
-	result = acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE);
+	result = acpi_bus_add(handle, &device);
 	if (result) {
 		acpi_handle_warn(handle, "Cannot add acpi bus\n");
 		return -EINVAL;
diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c
index 98b85e3e4781..0688f83bc436 100644
--- a/drivers/acpi/container.c
+++ b/drivers/acpi/container.c
@@ -135,20 +135,6 @@ static int acpi_container_remove(struct acpi_device *device, int type)
 	return status;
 }
 
-static int container_device_add(struct acpi_device **device, acpi_handle handle)
-{
-	acpi_handle phandle;
-	struct acpi_device *pdev;
-
-	if (acpi_get_parent(handle, &phandle))
-		return -ENODEV;
-
-	if (acpi_bus_get_device(phandle, &pdev))
-		return -ENODEV;
-
-	return acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE);
-}
-
 static void container_notify_cb(acpi_handle handle, u32 type, void *context)
 {
 	struct acpi_device *device = NULL;
@@ -180,7 +166,7 @@ static void container_notify_cb(acpi_handle handle, u32 type, void *context)
 		if (!ACPI_FAILURE(status) || device)
 			break;
 
-		result = container_device_add(&device, handle);
+		result = acpi_bus_add(handle, &device);
 		if (result) {
 			acpi_handle_warn(handle, "Failed to add container\n");
 			break;
diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index f32bd47b35e0..ff30582d2e1d 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -310,8 +310,6 @@ static int dock_present(struct dock_station *ds)
 static struct acpi_device * dock_create_acpi_device(acpi_handle handle)
 {
 	struct acpi_device *device;
-	struct acpi_device *parent_device;
-	acpi_handle parent;
 	int ret;
 
 	if (acpi_bus_get_device(handle, &device)) {
@@ -319,16 +317,9 @@ static struct acpi_device * dock_create_acpi_device(acpi_handle handle)
 		 * no device created for this object,
 		 * so we should create one.
 		 */
-		acpi_get_parent(handle, &parent);
-		if (acpi_bus_get_device(parent, &parent_device))
-			parent_device = NULL;
-
-		ret = acpi_bus_add(&device, parent_device, handle,
-			ACPI_BUS_TYPE_DEVICE);
-		if (ret) {
+		ret = acpi_bus_add(handle, &device);
+		if (ret)
 			pr_debug("error adding bus, %x\n", -ret);
-			return NULL;
-		}
 	}
 	return device;
 }
diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index e83311bf1ebd..18b292e12b38 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -677,28 +677,6 @@ static int is_processor_present(acpi_handle handle)
 	return 0;
 }
 
-static
-int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
-{
-	acpi_handle phandle;
-	struct acpi_device *pdev;
-
-
-	if (acpi_get_parent(handle, &phandle)) {
-		return -ENODEV;
-	}
-
-	if (acpi_bus_get_device(phandle, &pdev)) {
-		return -ENODEV;
-	}
-
-	if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
-		return -ENODEV;
-	}
-
-	return 0;
-}
-
 static void acpi_processor_hotplug_notify(acpi_handle handle,
 					  u32 event, void *data)
 {
@@ -721,7 +699,7 @@ static void acpi_processor_hotplug_notify(acpi_handle handle,
 		if (!acpi_bus_get_device(handle, &device))
 			break;
 
-		result = acpi_processor_device_add(handle, &device);
+		result = acpi_bus_add(handle, &device);
 		if (result) {
 			acpi_handle_err(handle, "Unable to add the device\n");
 			break;
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 6321cab4e5ff..25095bf57bba 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1650,25 +1650,33 @@ static int acpi_bus_scan(acpi_handle handle, bool start,
 	return ret;
 }
 
-/*
- * acpi_bus_add
+/**
+ * acpi_bus_add - Add ACPI device node objects in a given namespace scope.
+ * @handle: Root of the namespace scope to scan.
+ * @ret: Location to store a return struct acpi_device pointer.
+ *
+ * Scan a given ACPI tree (probably recently hot-plugged) and create and add
+ * found devices.
  *
- * scan a given ACPI tree and (probably recently hot-plugged)
- * create and add found devices.
+ * If no devices were found, -ENODEV is returned, but it does not mean that
+ * there has been a real error.  There just have been no suitable ACPI objects
+ * in the table trunk from which the kernel could create a device and add an
+ * appropriate driver.
  *
- * If no devices were found -ENODEV is returned which does not
- * mean that this is a real error, there just have been no suitable
- * ACPI objects in the table trunk from which the kernel could create
- * a device and add an appropriate driver.
+ * If 0 is returned, the memory location pointed to by @ret will be populated
+ * with a pointer to a struct acpi_device created while scanning the namespace.
+ * If @handle corresponds to a device node, that will be a pointer to the struct
+ * acpi_device object corresponding to @handle.  Otherwise, it will be a pointer
+ * to a struct acpi_device corresponding to one of its descendants.
+ *
+ * If an error code is returned, NULL will be stored in the memory location
+ * pointed to by @ret.
  */
-
-int
-acpi_bus_add(struct acpi_device **child,
-	     struct acpi_device *parent, acpi_handle handle, int type)
+int acpi_bus_add(acpi_handle handle, struct acpi_device **ret)
 {
 	int err;
 
-	err = acpi_bus_scan(handle, false, child);
+	err = acpi_bus_scan(handle, false, ret);
 	if (err)
 		return err;
 
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index 7e2bad4c2fcc..dfc2df54b93a 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -734,15 +734,9 @@ static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
  */
 static int acpiphp_bus_add(struct acpiphp_func *func)
 {
-	acpi_handle phandle;
-	struct acpi_device *device, *pdevice;
+	struct acpi_device *device;
 	int ret_val;
 
-	acpi_get_parent(func->handle, &phandle);
-	if (acpi_bus_get_device(phandle, &pdevice)) {
-		dbg("no parent device, assuming NULL\n");
-		pdevice = NULL;
-	}
 	if (!acpi_bus_get_device(func->handle, &device)) {
 		dbg("bus exists... trim\n");
 		/* this shouldn't be in here, so remove
@@ -752,8 +746,7 @@ static int acpiphp_bus_add(struct acpiphp_func *func)
 		dbg("acpi_bus_trim return %x\n", ret_val);
 	}
 
-	ret_val = acpi_bus_add(&device, pdevice, func->handle,
-		ACPI_BUS_TYPE_DEVICE);
+	ret_val = acpi_bus_add(func->handle, &device);
 	if (ret_val) {
 		dbg("error adding bus, %x\n",
 			-ret_val);
@@ -1129,8 +1122,7 @@ static int acpiphp_configure_bridge (acpi_handle handle)
 
 static void handle_bridge_insertion(acpi_handle handle, u32 type)
 {
-	struct acpi_device *device, *pdevice;
-	acpi_handle phandle;
+	struct acpi_device *device;
 
 	if ((type != ACPI_NOTIFY_BUS_CHECK) &&
 			(type != ACPI_NOTIFY_DEVICE_CHECK)) {
@@ -1138,12 +1130,7 @@ static void handle_bridge_insertion(acpi_handle handle, u32 type)
 		return;
 	}
 
-	acpi_get_parent(handle, &phandle);
-	if (acpi_bus_get_device(phandle, &pdevice)) {
-		dbg("no parent device, assuming NULL\n");
-		pdevice = NULL;
-	}
-	if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
+	if (acpi_bus_add(handle, &device)) {
 		err("cannot add bridge to acpi list\n");
 		return;
 	}
diff --git a/drivers/pci/hotplug/sgi_hotplug.c b/drivers/pci/hotplug/sgi_hotplug.c
index 20c960d5317d..801b58d1f78e 100644
--- a/drivers/pci/hotplug/sgi_hotplug.c
+++ b/drivers/pci/hotplug/sgi_hotplug.c
@@ -448,8 +448,7 @@ static int enable_slot(struct hotplug_slot *bss_hotplug_slot)
 			if (ACPI_SUCCESS(ret) &&
 			    (adr>>16) == (slot->device_num + 1)) {
 
-				ret = acpi_bus_add(&device, pdevice, chandle,
-						   ACPI_BUS_TYPE_DEVICE);
+				ret = acpi_bus_add(chandle, &device);
 				if (ACPI_FAILURE(ret)) {
 					printk(KERN_ERR "%s: acpi_bus_add "
 					       "failed (0x%x) for slot %d "
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 6d47a584c0bc..75c6b3f2250d 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -358,8 +358,7 @@ static inline int acpi_bus_generate_proc_event(struct acpi_device *device, u8 ty
 #endif
 int acpi_bus_register_driver(struct acpi_driver *driver);
 void acpi_bus_unregister_driver(struct acpi_driver *driver);
-int acpi_bus_add(struct acpi_device **child, struct acpi_device *parent,
-		 acpi_handle handle, int type);
+int acpi_bus_add(acpi_handle handle, struct acpi_device **ret);
 void acpi_bus_hot_remove_device(void *context);
 int acpi_bus_trim(struct acpi_device *start, int rmdevice);
 acpi_status acpi_bus_get_ejd(acpi_handle handle, acpi_handle * ejd);
-- 
cgit v1.2.3


From 0cd6ac52b333f66ee64e50ed216ec99231092dcd Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Fri, 21 Dec 2012 00:36:49 +0100
Subject: ACPI: Make acpi_bus_scan() and acpi_bus_add() take only one argument

The callers of acpi_bus_add() usually assume that if it has
succeeded, then a struct acpi_device object has been attached to
the handle passed as the first argument.  Unfortunately, however,
this assumption is wrong, because acpi_bus_scan(), and acpi_bus_add()
too as a result, may return a pointer to a different struct
acpi_device object on success (it may be an object corresponding to
one of the descendant ACPI nodes in the namespace scope below that
handle).

For this reason, the callers of acpi_bus_add() who care about
whether or not a struct acpi_device object has been created for
its first argument need to check that using acpi_bus_get_device()
anyway, so the second argument of acpi_bus_add() is not really
useful for them.  The same observation applies to acpi_bus_scan()
executed directly from acpi_scan_init().

Therefore modify the relevant callers of acpi_bus_add() to check the
existence of the struct acpi_device in question with the help of
acpi_bus_get_device() and drop the no longer necessary second
argument of acpi_bus_add().  Accordingly, modify acpi_scan_init() to
use acpi_bus_get_device() to get acpi_root and drop the no longer
needed second argument of acpi_bus_scan().

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Acked-by: Toshi Kani <toshi.kani@hp.com>
---
 drivers/acpi/acpi_memhotplug.c     |  7 ++++++-
 drivers/acpi/container.c           |  7 ++++++-
 drivers/acpi/dock.c                |  4 +++-
 drivers/acpi/processor_driver.c    |  8 ++++++--
 drivers/acpi/scan.c                | 38 +++++++++++---------------------------
 drivers/pci/hotplug/acpiphp_glue.c | 19 +++++++++++--------
 drivers/pci/hotplug/sgi_hotplug.c  |  3 +--
 include/acpi/acpi_bus.h            |  2 +-
 8 files changed, 45 insertions(+), 43 deletions(-)

(limited to 'drivers/pci/hotplug')

diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index d0a7da704d49..327ab4459558 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -167,11 +167,16 @@ acpi_memory_get_device(acpi_handle handle,
 	 * Now add the notified device.  This creates the acpi_device
 	 * and invokes .add function
 	 */
-	result = acpi_bus_add(handle, &device);
+	result = acpi_bus_add(handle);
 	if (result) {
 		acpi_handle_warn(handle, "Cannot add acpi bus\n");
 		return -EINVAL;
 	}
+	result = acpi_bus_get_device(handle, &device);
+	if (result) {
+		acpi_handle_warn(handle, "Missing device object\n");
+		return -EINVAL;
+	}
 
       end:
 	*mem_device = acpi_driver_data(device);
diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c
index 0688f83bc436..f8fb2281f34a 100644
--- a/drivers/acpi/container.c
+++ b/drivers/acpi/container.c
@@ -166,11 +166,16 @@ static void container_notify_cb(acpi_handle handle, u32 type, void *context)
 		if (!ACPI_FAILURE(status) || device)
 			break;
 
-		result = acpi_bus_add(handle, &device);
+		result = acpi_bus_add(handle);
 		if (result) {
 			acpi_handle_warn(handle, "Failed to add container\n");
 			break;
 		}
+		result = acpi_bus_get_device(handle, &device);
+		if (result) {
+			acpi_handle_warn(handle, "Missing device object\n");
+			break;
+		}
 
 		kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 		ost_code = ACPI_OST_SC_SUCCESS;
diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index ff30582d2e1d..9e31b2bd93d3 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -317,9 +317,11 @@ static struct acpi_device * dock_create_acpi_device(acpi_handle handle)
 		 * no device created for this object,
 		 * so we should create one.
 		 */
-		ret = acpi_bus_add(handle, &device);
+		ret = acpi_bus_add(handle);
 		if (ret)
 			pr_debug("error adding bus, %x\n", -ret);
+
+		acpi_bus_get_device(handle, &device);
 	}
 	return device;
 }
diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index 18b292e12b38..0777663f443e 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -699,12 +699,16 @@ static void acpi_processor_hotplug_notify(acpi_handle handle,
 		if (!acpi_bus_get_device(handle, &device))
 			break;
 
-		result = acpi_bus_add(handle, &device);
+		result = acpi_bus_add(handle);
 		if (result) {
 			acpi_handle_err(handle, "Unable to add the device\n");
 			break;
 		}
-
+		result = acpi_bus_get_device(handle, &device);
+		if (result) {
+			acpi_handle_err(handle, "Missing device object\n");
+			break;
+		}
 		ost_code = ACPI_OST_SC_SUCCESS;
 		break;
 
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index e3aed481aed2..3d44c705a3a2 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1620,37 +1620,27 @@ static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
 	return status;
 }
 
-static int acpi_bus_scan(acpi_handle handle, struct acpi_device **child)
+static int acpi_bus_scan(acpi_handle handle)
 {
 	void *device = NULL;
-	acpi_status status;
-	int ret = -ENODEV;
 
-	status = acpi_bus_check_add(handle, 0, NULL, &device);
-	if (ACPI_SUCCESS(status))
+	if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
 		acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 				    acpi_bus_check_add, NULL, NULL, &device);
 
 	if (!device)
-		goto out;
+		return -ENODEV;
 
-	ret = 0;
-	status = acpi_bus_device_attach(handle, 0, NULL, NULL);
-	if (ACPI_SUCCESS(status))
+	if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
 		acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 				    acpi_bus_device_attach, NULL, NULL, NULL);
 
- out:
-	if (child)
-		*child = device;
-
-	return ret;
+	return 0;
 }
 
 /**
  * acpi_bus_add - Add ACPI device node objects in a given namespace scope.
  * @handle: Root of the namespace scope to scan.
- * @ret: Location to store a return struct acpi_device pointer.
  *
  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
  * found devices.
@@ -1659,21 +1649,12 @@ static int acpi_bus_scan(acpi_handle handle, struct acpi_device **child)
  * there has been a real error.  There just have been no suitable ACPI objects
  * in the table trunk from which the kernel could create a device and add an
  * appropriate driver.
- *
- * If 0 is returned, the memory location pointed to by @ret will be populated
- * with a pointer to a struct acpi_device created while scanning the namespace.
- * If @handle corresponds to a device node, that will be a pointer to the struct
- * acpi_device object corresponding to @handle.  Otherwise, it will be a pointer
- * to a struct acpi_device corresponding to one of its descendants.
- *
- * If an error code is returned, NULL will be stored in the memory location
- * pointed to by @ret.
  */
-int acpi_bus_add(acpi_handle handle, struct acpi_device **ret)
+int acpi_bus_add(acpi_handle handle)
 {
 	int err;
 
-	err = acpi_bus_scan(handle, ret);
+	err = acpi_bus_scan(handle);
 	if (err)
 		return err;
 
@@ -1777,8 +1758,11 @@ int __init acpi_scan_init(void)
 	/*
 	 * Enumerate devices in the ACPI namespace.
 	 */
-	result = acpi_bus_scan(ACPI_ROOT_OBJECT, &acpi_root);
+	result = acpi_bus_scan(ACPI_ROOT_OBJECT);
+	if (result)
+		return result;
 
+	result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
 	if (!result)
 		result = acpi_bus_scan_fixed();
 
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index dfc2df54b93a..91b5ad875c53 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -746,14 +746,13 @@ static int acpiphp_bus_add(struct acpiphp_func *func)
 		dbg("acpi_bus_trim return %x\n", ret_val);
 	}
 
-	ret_val = acpi_bus_add(func->handle, &device);
-	if (ret_val) {
-		dbg("error adding bus, %x\n",
-			-ret_val);
-		goto acpiphp_bus_add_out;
-	}
+	ret_val = acpi_bus_add(func->handle);
+	if (!ret_val)
+		ret_val = acpi_bus_get_device(func->handle, &device);
+
+	if (ret_val)
+		dbg("error adding bus, %x\n", -ret_val);
 
-acpiphp_bus_add_out:
 	return ret_val;
 }
 
@@ -1130,10 +1129,14 @@ static void handle_bridge_insertion(acpi_handle handle, u32 type)
 		return;
 	}
 
-	if (acpi_bus_add(handle, &device)) {
+	if (acpi_bus_add(handle)) {
 		err("cannot add bridge to acpi list\n");
 		return;
 	}
+	if (acpi_bus_get_device(handle, &device)) {
+		err("ACPI device object missing\n");
+		return;
+	}
 	if (!acpiphp_configure_bridge(handle))
 		add_bridge(handle);
 	else
diff --git a/drivers/pci/hotplug/sgi_hotplug.c b/drivers/pci/hotplug/sgi_hotplug.c
index 801b58d1f78e..f3c419256d2a 100644
--- a/drivers/pci/hotplug/sgi_hotplug.c
+++ b/drivers/pci/hotplug/sgi_hotplug.c
@@ -412,7 +412,6 @@ static int enable_slot(struct hotplug_slot *bss_hotplug_slot)
 	if (SN_ACPI_BASE_SUPPORT() && ssdt) {
 		unsigned long long adr;
 		struct acpi_device *pdevice;
-		struct acpi_device *device;
 		acpi_handle phandle;
 		acpi_handle chandle = NULL;
 		acpi_handle rethandle;
@@ -448,7 +447,7 @@ static int enable_slot(struct hotplug_slot *bss_hotplug_slot)
 			if (ACPI_SUCCESS(ret) &&
 			    (adr>>16) == (slot->device_num + 1)) {
 
-				ret = acpi_bus_add(chandle, &device);
+				ret = acpi_bus_add(chandle);
 				if (ACPI_FAILURE(ret)) {
 					printk(KERN_ERR "%s: acpi_bus_add "
 					       "failed (0x%x) for slot %d "
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 056cb0cd8eff..5e1d5a1b477f 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -351,7 +351,7 @@ static inline int acpi_bus_generate_proc_event(struct acpi_device *device, u8 ty
 #endif
 int acpi_bus_register_driver(struct acpi_driver *driver);
 void acpi_bus_unregister_driver(struct acpi_driver *driver);
-int acpi_bus_add(acpi_handle handle, struct acpi_device **ret);
+int acpi_bus_add(acpi_handle handle);
 void acpi_bus_hot_remove_device(void *context);
 int acpi_bus_trim(struct acpi_device *start, int rmdevice);
 acpi_status acpi_bus_get_ejd(acpi_handle handle, acpi_handle * ejd);
-- 
cgit v1.2.3


From ae281795ec92d35dd1631401829124acab965b1f Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Tue, 15 Jan 2013 13:23:53 +0100
Subject: ACPI / scan: Drop the second argument of acpi_bus_trim()

All callers of acpi_bus_trim() pass 1 (true) as the second argument
of it, so remove that argument entirely and change acpi_bus_trim()
to always behave as though it were 1.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Toshi Kani <toshi.kani@hp.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Acked-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
---
 drivers/acpi/dock.c                |  2 +-
 drivers/acpi/scan.c                | 16 ++++------------
 drivers/pci/hotplug/acpiphp_glue.c |  4 ++--
 drivers/pci/hotplug/sgi_hotplug.c  |  2 +-
 include/acpi/acpi_bus.h            |  2 +-
 5 files changed, 9 insertions(+), 17 deletions(-)

(limited to 'drivers/pci/hotplug')

diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 9e31b2bd93d3..4a56a8b2e51e 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -339,7 +339,7 @@ static void dock_remove_acpi_device(acpi_handle handle)
 	int ret;
 
 	if (!acpi_bus_get_device(handle, &device)) {
-		ret = acpi_bus_trim(device, 1);
+		ret = acpi_bus_trim(device);
 		if (ret)
 			pr_debug("error removing bus, %x\n", -ret);
 	}
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index a26c09efc286..d14ce446b469 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -133,7 +133,7 @@ void acpi_bus_hot_remove_device(void *context)
 	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 		"Hot-removing device %s...\n", dev_name(&device->dev)));
 
-	if (acpi_bus_trim(device, 1)) {
+	if (acpi_bus_trim(device)) {
 		printk(KERN_ERR PREFIX
 				"Removing device failed\n");
 		goto err_out;
@@ -1374,7 +1374,7 @@ static int acpi_device_set_context(struct acpi_device *device)
 	return -ENODEV;
 }
 
-static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
+static int acpi_bus_remove(struct acpi_device *dev)
 {
 	if (!dev)
 		return -EINVAL;
@@ -1382,9 +1382,6 @@ static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
 	dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
 	device_release_driver(&dev->dev);
 
-	if (!rmdevice)
-		return 0;
-
 	acpi_device_unregister(dev);
 
 	return 0;
@@ -1642,7 +1639,7 @@ int acpi_bus_add(acpi_handle handle)
 }
 EXPORT_SYMBOL(acpi_bus_add);
 
-int acpi_bus_trim(struct acpi_device *start, int rmdevice)
+int acpi_bus_trim(struct acpi_device *start)
 {
 	acpi_status status;
 	struct acpi_device *parent, *child;
@@ -1668,12 +1665,7 @@ int acpi_bus_trim(struct acpi_device *start, int rmdevice)
 			acpi_get_parent(phandle, &phandle);
 			child = parent;
 			parent = parent->parent;
-
-			if (level == 0)
-				err = acpi_bus_remove(child, rmdevice);
-			else
-				err = acpi_bus_remove(child, 1);
-
+			err = acpi_bus_remove(child);
 			continue;
 		}
 
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index 91b5ad875c53..22006f2d9dd5 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -742,7 +742,7 @@ static int acpiphp_bus_add(struct acpiphp_func *func)
 		/* this shouldn't be in here, so remove
 		 * the bus then re-add it...
 		 */
-		ret_val = acpi_bus_trim(device, 1);
+		ret_val = acpi_bus_trim(device);
 		dbg("acpi_bus_trim return %x\n", ret_val);
 	}
 
@@ -772,7 +772,7 @@ static int acpiphp_bus_trim(acpi_handle handle)
 		return retval;
 	}
 
-	retval = acpi_bus_trim(device, 1);
+	retval = acpi_bus_trim(device);
 	if (retval)
 		err("cannot remove from acpi list\n");
 
diff --git a/drivers/pci/hotplug/sgi_hotplug.c b/drivers/pci/hotplug/sgi_hotplug.c
index f3c419256d2a..2e006ee5738b 100644
--- a/drivers/pci/hotplug/sgi_hotplug.c
+++ b/drivers/pci/hotplug/sgi_hotplug.c
@@ -535,7 +535,7 @@ static int disable_slot(struct hotplug_slot *bss_hotplug_slot)
 				ret = acpi_bus_get_device(chandle,
 							  &device);
 				if (ACPI_SUCCESS(ret))
-					acpi_bus_trim(device, 1);
+					acpi_bus_trim(device);
 			}
 		}
 
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index efe5f746c561..566f1fdabbd2 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -348,7 +348,7 @@ int acpi_bus_register_driver(struct acpi_driver *driver);
 void acpi_bus_unregister_driver(struct acpi_driver *driver);
 int acpi_bus_add(acpi_handle handle);
 void acpi_bus_hot_remove_device(void *context);
-int acpi_bus_trim(struct acpi_device *start, int rmdevice);
+int acpi_bus_trim(struct acpi_device *start);
 acpi_status acpi_bus_get_ejd(acpi_handle handle, acpi_handle * ejd);
 int acpi_match_device_ids(struct acpi_device *device,
 			  const struct acpi_device_id *ids);
-- 
cgit v1.2.3


From b8bd759acd05281abf88cddef30c57313c109697 Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Sat, 19 Jan 2013 01:27:35 +0100
Subject: ACPI / scan: Drop acpi_bus_add() and use acpi_bus_scan() instead

The only difference between acpi_bus_scan() and acpi_bus_add() is the
invocation of acpi_update_all_gpes() in the latter which in fact is
unnecessary, because acpi_update_all_gpes() has already been called
by acpi_scan_init() and the way it is implemented guarantees the next
invocations of it to do nothing.

For this reason, drop acpi_bus_add() and make all its callers use
acpi_bus_scan() directly instead of it.  Additionally, rearrange the
code in acpi_scan_init() slightly to improve the visibility of the
acpi_update_all_gpes() call in there.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
---
 drivers/acpi/acpi_memhotplug.c     |  2 +-
 drivers/acpi/container.c           |  2 +-
 drivers/acpi/dock.c                |  2 +-
 drivers/acpi/processor_driver.c    |  2 +-
 drivers/acpi/scan.c                | 54 ++++++++++++++++----------------------
 drivers/pci/hotplug/acpiphp_glue.c |  4 +--
 drivers/pci/hotplug/sgi_hotplug.c  |  4 +--
 include/acpi/acpi_bus.h            |  2 +-
 8 files changed, 31 insertions(+), 41 deletions(-)

(limited to 'drivers/pci/hotplug')

diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index eaddb7a89c70..15ea22fc1f5e 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -167,7 +167,7 @@ acpi_memory_get_device(acpi_handle handle,
 	 * Now add the notified device.  This creates the acpi_device
 	 * and invokes .add function
 	 */
-	result = acpi_bus_add(handle);
+	result = acpi_bus_scan(handle);
 	if (result) {
 		acpi_handle_warn(handle, "Cannot add acpi bus\n");
 		return -EINVAL;
diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c
index f8fb2281f34a..cc79d3e53a39 100644
--- a/drivers/acpi/container.c
+++ b/drivers/acpi/container.c
@@ -166,7 +166,7 @@ static void container_notify_cb(acpi_handle handle, u32 type, void *context)
 		if (!ACPI_FAILURE(status) || device)
 			break;
 
-		result = acpi_bus_add(handle);
+		result = acpi_bus_scan(handle);
 		if (result) {
 			acpi_handle_warn(handle, "Failed to add container\n");
 			break;
diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 4a56a8b2e51e..420d24fc9388 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -317,7 +317,7 @@ static struct acpi_device * dock_create_acpi_device(acpi_handle handle)
 		 * no device created for this object,
 		 * so we should create one.
 		 */
-		ret = acpi_bus_add(handle);
+		ret = acpi_bus_scan(handle);
 		if (ret)
 			pr_debug("error adding bus, %x\n", -ret);
 
diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index a24ee43e06e4..9c5929a17d3a 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -699,7 +699,7 @@ static void acpi_processor_hotplug_notify(acpi_handle handle,
 		if (!acpi_bus_get_device(handle, &device))
 			break;
 
-		result = acpi_bus_add(handle);
+		result = acpi_bus_scan(handle);
 		if (result) {
 			acpi_handle_err(handle, "Unable to add the device\n");
 			break;
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 388b59c096dc..7c43bdc36abc 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1577,26 +1577,8 @@ static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
 	return status;
 }
 
-static int acpi_bus_scan(acpi_handle handle)
-{
-	void *device = NULL;
-
-	if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
-		acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
-				    acpi_bus_check_add, NULL, NULL, &device);
-
-	if (!device)
-		return -ENODEV;
-
-	if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
-		acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
-				    acpi_bus_device_attach, NULL, NULL, NULL);
-
-	return 0;
-}
-
 /**
- * acpi_bus_add - Add ACPI device node objects in a given namespace scope.
+ * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
  * @handle: Root of the namespace scope to scan.
  *
  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
@@ -1607,18 +1589,24 @@ static int acpi_bus_scan(acpi_handle handle)
  * in the table trunk from which the kernel could create a device and add an
  * appropriate driver.
  */
-int acpi_bus_add(acpi_handle handle)
+int acpi_bus_scan(acpi_handle handle)
 {
-	int err;
+	void *device = NULL;
 
-	err = acpi_bus_scan(handle);
-	if (err)
-		return err;
+	if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
+		acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
+				    acpi_bus_check_add, NULL, NULL, &device);
+
+	if (!device)
+		return -ENODEV;
+
+	if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
+		acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
+				    acpi_bus_device_attach, NULL, NULL, NULL);
 
-	acpi_update_all_gpes();
 	return 0;
 }
-EXPORT_SYMBOL(acpi_bus_add);
+EXPORT_SYMBOL(acpi_bus_scan);
 
 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
 					  void *not_used, void **ret_not_used)
@@ -1708,13 +1696,15 @@ int __init acpi_scan_init(void)
 		return result;
 
 	result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
-	if (!result)
-		result = acpi_bus_scan_fixed();
-
 	if (result)
+		return result;
+
+	result = acpi_bus_scan_fixed();
+	if (result) {
 		acpi_device_unregister(acpi_root);
-	else
-		acpi_update_all_gpes();
+		return result;
+	}
 
-	return result;
+	acpi_update_all_gpes();
+	return 0;
 }
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index 22006f2d9dd5..9e2b1f6dbe41 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -746,7 +746,7 @@ static int acpiphp_bus_add(struct acpiphp_func *func)
 		dbg("acpi_bus_trim return %x\n", ret_val);
 	}
 
-	ret_val = acpi_bus_add(func->handle);
+	ret_val = acpi_bus_scan(func->handle);
 	if (!ret_val)
 		ret_val = acpi_bus_get_device(func->handle, &device);
 
@@ -1129,7 +1129,7 @@ static void handle_bridge_insertion(acpi_handle handle, u32 type)
 		return;
 	}
 
-	if (acpi_bus_add(handle)) {
+	if (acpi_bus_scan(handle)) {
 		err("cannot add bridge to acpi list\n");
 		return;
 	}
diff --git a/drivers/pci/hotplug/sgi_hotplug.c b/drivers/pci/hotplug/sgi_hotplug.c
index 2e006ee5738b..ae606b3e991e 100644
--- a/drivers/pci/hotplug/sgi_hotplug.c
+++ b/drivers/pci/hotplug/sgi_hotplug.c
@@ -447,9 +447,9 @@ static int enable_slot(struct hotplug_slot *bss_hotplug_slot)
 			if (ACPI_SUCCESS(ret) &&
 			    (adr>>16) == (slot->device_num + 1)) {
 
-				ret = acpi_bus_add(chandle);
+				ret = acpi_bus_scan(chandle);
 				if (ACPI_FAILURE(ret)) {
-					printk(KERN_ERR "%s: acpi_bus_add "
+					printk(KERN_ERR "%s: acpi_bus_scan "
 					       "failed (0x%x) for slot %d "
 					       "func %d\n", __func__,
 					       ret, (int)(adr>>16),
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 567851b4f043..2c722deb2490 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -346,7 +346,7 @@ static inline int acpi_bus_generate_proc_event(struct acpi_device *device, u8 ty
 #endif
 int acpi_bus_register_driver(struct acpi_driver *driver);
 void acpi_bus_unregister_driver(struct acpi_driver *driver);
-int acpi_bus_add(acpi_handle handle);
+int acpi_bus_scan(acpi_handle handle);
 void acpi_bus_hot_remove_device(void *context);
 int acpi_bus_trim(struct acpi_device *start);
 acpi_status acpi_bus_get_ejd(acpi_handle handle, acpi_handle * ejd);
-- 
cgit v1.2.3