ACPI / driver core: Introduce struct acpi_dev_node and related macros

To avoid adding an ACPI handle pointer to struct device on
architectures that don't use ACPI, or generally when CONFIG_ACPI is
not set, in which cases that pointer is useless, define struct
acpi_dev_node that will contain the handle pointer if CONFIG_ACPI is
set and will be empty otherwise and use it to represent the ACPI
device node field in struct device.

In addition to that define macros for reading and setting the ACPI
handle of a device that don't generate code when CONFIG_ACPI is
unset.  Modify the ACPI subsystem to use those macros instead of
referring to the given device's ACPI handle directly.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 10 insertions, 10 deletions

diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index 3e75d6e5a469..01551840d236 100644
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -134,12 +134,12 @@ static int acpi_bind_one(struct device *dev, acpi_handle handle)
 	char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2];
 	int retval = -EINVAL;
 
-	if (dev->acpi_handle) {
+	if (ACPI_HANDLE(dev)) {
 		if (handle) {
 			dev_warn(dev, "ACPI handle is already set\n");
 			return -EINVAL;
 		} else {
-			handle = dev->acpi_handle;
+			handle = ACPI_HANDLE(dev);
 		}
 	}
 	if (!handle)
@@ -181,8 +181,8 @@ static int acpi_bind_one(struct device *dev, acpi_handle handle)
 
 	mutex_unlock(&acpi_dev->physical_node_lock);
 
-	if (!dev->acpi_handle)
-		dev->acpi_handle = handle;
+	if (!ACPI_HANDLE(dev))
+		ACPI_HANDLE_SET(dev, acpi_dev->handle);
 
 	if (!physical_node->node_id)
 		strcpy(physical_node_name, PHYSICAL_NODE_STRING);
@@ -200,7 +200,7 @@ static int acpi_bind_one(struct device *dev, acpi_handle handle)
 	return 0;
 
  err:
-	dev->acpi_handle = NULL;
+	ACPI_HANDLE_SET(dev, NULL);
 	put_device(dev);
 	return retval;
 
@@ -217,10 +217,10 @@ static int acpi_unbind_one(struct device *dev)
 	acpi_status status;
 	struct list_head *node, *next;
 
-	if (!dev->acpi_handle)
+	if (!ACPI_HANDLE(dev))
 		return 0;
 
-	status = acpi_bus_get_device(dev->acpi_handle, &acpi_dev);
+	status = acpi_bus_get_device(ACPI_HANDLE(dev), &acpi_dev);
 	if (ACPI_FAILURE(status))
 		goto err;
 
@@ -246,7 +246,7 @@ static int acpi_unbind_one(struct device *dev)
 
 		sysfs_remove_link(&acpi_dev->dev.kobj, physical_node_name);
 		sysfs_remove_link(&dev->kobj, "firmware_node");
-		dev->acpi_handle = NULL;
+		ACPI_HANDLE_SET(dev, NULL);
 		/* acpi_bind_one increase refcnt by one */
 		put_device(dev);
 		kfree(entry);
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index d842569395a9..e92ca67d0e46 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -386,8 +386,8 @@ const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 {
 	struct acpi_device *adev;
 
-	if (!ids || !dev->acpi_handle
-	    || ACPI_FAILURE(acpi_bus_get_device(dev->acpi_handle, &adev)))
+	if (!ids || !ACPI_HANDLE(dev)
+	    || ACPI_FAILURE(acpi_bus_get_device(ACPI_HANDLE(dev), &adev)))
 		return NULL;
 
 	return __acpi_match_device(adev, ids);