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ACPI: introduce a function to find the first physical device

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Factor out the code that finds the first physical device
of a given ACPI device.  It is used in several places.

Signed-off-by: Aleksey Makarov <aleksey.makarov@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Aleksey Makarov 2016-02-16 15:52:38 +03:00 committed by Rafael J. Wysocki
parent 18558cae02
commit 3b95bd1605
3 changed files with 23 additions and 23 deletions
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19
drivers/acpi/acpi_platform.c
View File

@ -43,7 +43,6 @@ static const struct acpi_device_id forbidden_id_list[] = {
struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
{
struct platform_device *pdev = NULL;
struct acpi_device *acpi_parent;
struct platform_device_info pdevinfo;
struct resource_entry *rentry;
struct list_head resource_list;
@ -82,22 +81,8 @@ struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
* attached to it, that physical device should be the parent of the
* platform device we are about to create.
*/
pdevinfo.parent = NULL;
acpi_parent = adev->parent;
if (acpi_parent) {
struct acpi_device_physical_node *entry;
struct list_head *list;
mutex_lock(&acpi_parent->physical_node_lock);
list = &acpi_parent->physical_node_list;
if (!list_empty(list)) {
entry = list_first_entry(list,
struct acpi_device_physical_node,
node);
pdevinfo.parent = entry->dev;
}
mutex_unlock(&acpi_parent->physical_node_lock);
}
pdevinfo.parent = adev->parent ?
acpi_get_first_physical_node(adev->parent) : NULL;
pdevinfo.name = dev_name(&adev->dev);
pdevinfo.id = -1;
pdevinfo.res = resources;

26
drivers/acpi/bus.c
View File

@ -479,24 +479,38 @@ static void acpi_device_remove_notify_handler(struct acpi_device *device)
Device Matching
-------------------------------------------------------------------------- */
static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
const struct device *dev)
/**
* acpi_get_first_physical_node - Get first physical node of an ACPI device
* @adev: ACPI device in question
*
* Return: First physical node of ACPI device @adev
*/
struct device *acpi_get_first_physical_node(struct acpi_device *adev)
{
struct mutex *physical_node_lock = &adev->physical_node_lock;
struct device *phys_dev;
mutex_lock(physical_node_lock);
if (list_empty(&adev->physical_node_list)) {
adev = NULL;
phys_dev = NULL;
} else {
const struct acpi_device_physical_node *node;
node = list_first_entry(&adev->physical_node_list,
struct acpi_device_physical_node, node);
if (node->dev != dev)
adev = NULL;
phys_dev = node->dev;
}
mutex_unlock(physical_node_lock);
return adev;
return phys_dev;
}
static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
const struct device *dev)
{
const struct device *phys_dev = acpi_get_first_physical_node(adev);
return phys_dev && phys_dev == dev ? adev : NULL;
}
/**

1
drivers/acpi/internal.h
View File

@ -106,6 +106,7 @@ bool acpi_device_is_present(struct acpi_device *adev);
bool acpi_device_is_battery(struct acpi_device *adev);
bool acpi_device_is_first_physical_node(struct acpi_device *adev,
const struct device *dev);
struct device *acpi_get_first_physical_node(struct acpi_device *adev);
/* --------------------------------------------------------------------------
Device Matching and Notification