[PATCH v1 2/4] ACPI: PCI: Introduce acpi_dev_get_pci_dev()

[Rafael J. Wysocki]

From: "Rafael J. Wysocki" <rafael.j.wysocki@xxxxxxxxx>

Some acpi_get_pci_dev() callers already have a struct ACPI device for
which they want to get the struct pci_dev pointer of the associated
PCI device, so they don't need to look for one.

For this reason, add acpi_dev_get_pci_dev() that will get a PCI device
for a given ACPI one (if possible) and turn acpi_get_pci_dev() into
a static inline helper passing the acpi_fetch_acpi_dev() return value
directly to acpi_dev_get_pci_dev().

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
---
 drivers/acpi/pci_root.c     |   22 +++++++++++-----------
 include/acpi/acpi_drivers.h |    9 +++++++--
 2 files changed, 18 insertions(+), 13 deletions(-)

--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -292,20 +292,20 @@ struct acpi_pci_root *acpi_pci_find_root
 EXPORT_SYMBOL_GPL(acpi_pci_find_root);
 
 /**
- * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
- * @handle: the handle in question
+ * acpi_dev_get_pci_dev - Get a struct pci_dev for a given ACPI device
+ * @adev: Target ACPI device.
  *
- * Given an ACPI CA handle, the desired PCI device is located in the
- * list of PCI devices.
+ * Get the first PCI device associated with @adev, if present, and bump up its
+ * reference counter.
  *
- * If the device is found, its reference count is increased and this
- * function returns a pointer to its data structure.  The caller must
- * decrement the reference count by calling pci_dev_put().
- * If no device is found, %NULL is returned.
+ * Callers are responsible for dropping the PCI device reference obtained by
+ * this function.
+ *
+ * Return: The struct pci_dev pointer of a reference-counted PCI device on
+ * success or NULL on failure.
  */
-struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
+struct pci_dev *acpi_dev_get_pci_dev(struct acpi_device *adev)
 {
-	struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
 	struct acpi_device_physical_node *pn;
 
 	if (!adev)
@@ -322,7 +322,7 @@ struct pci_dev *acpi_get_pci_dev(acpi_ha
 
 	return NULL;
 }
-EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
+EXPORT_SYMBOL_GPL(acpi_dev_get_pci_dev);
 
 /**
  * acpi_pci_osc_control_set - Request control of PCI root _OSC features.
--- a/include/acpi/acpi_drivers.h
+++ b/include/acpi/acpi_drivers.h
@@ -59,14 +59,19 @@ int acpi_pci_link_free_irq(acpi_handle h
 struct pci_bus;
 
 #ifdef CONFIG_PCI
-struct pci_dev *acpi_get_pci_dev(acpi_handle);
+struct pci_dev *acpi_dev_get_pci_dev(struct acpi_device *adev);
 #else
-static inline struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
+static inline struct pci_dev *acpi_dev_get_pci_dev(struct acpi_device *adev)
 {
 	return NULL;
 }
 #endif
 
+static inline struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
+{
+	return acpi_dev_get_pci_dev(acpi_fetch_acpi_dev(handle));
+}
+
 /* Arch-defined function to add a bus to the system */
 
 struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root);