Merge branch 'acpi-pm'

[cascardo/linux.git] / drivers / acpi / bus.c

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 54a2e66..46506e7 100644 (file)
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -482,6 +482,43 @@ 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)
+{
+       struct mutex *physical_node_lock = &adev->physical_node_lock;
+
+       mutex_lock(physical_node_lock);
+       if (list_empty(&adev->physical_node_list)) {
+               adev = 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;
+       }
+       mutex_unlock(physical_node_lock);
+       return adev;
+}
+
+/**
+ * acpi_device_is_first_physical_node - Is given dev first physical node
+ * @adev: ACPI companion device
+ * @dev: Physical device to check
+ *
+ * Function checks if given @dev is the first physical devices attached to
+ * the ACPI companion device. This distinction is needed in some cases
+ * where the same companion device is shared between many physical devices.
+ *
+ * Note that the caller have to provide valid @adev pointer.
+ */
+bool acpi_device_is_first_physical_node(struct acpi_device *adev,
+                                       const struct device *dev)
+{
+       return !!acpi_primary_dev_companion(adev, dev);
+}
+
 /*
  * acpi_companion_match() - Can we match via ACPI companion device
  * @dev: Device in question
@@ -506,7 +543,6 @@ static void acpi_device_remove_notify_handler(struct acpi_device *device)
 struct acpi_device *acpi_companion_match(const struct device *dev)
 {
        struct acpi_device *adev;
-       struct mutex *physical_node_lock;
 
        adev = ACPI_COMPANION(dev);
        if (!adev)
@@ -515,21 +551,7 @@ struct acpi_device *acpi_companion_match(const struct device *dev)
        if (list_empty(&adev->pnp.ids))
                return NULL;
 
-       physical_node_lock = &adev->physical_node_lock;
-       mutex_lock(physical_node_lock);
-       if (list_empty(&adev->physical_node_list)) {
-               adev = 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;
-       }
-       mutex_unlock(physical_node_lock);
-
-       return adev;
+       return acpi_primary_dev_companion(adev, dev);
 }
 
 /**