diff options
Diffstat (limited to 'drivers/acpi/bus.c')
| -rw-r--r-- | drivers/acpi/bus.c | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index 891c42d1cd65..0e8567846f1a 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -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; } /** |