ACPI / bind: Rework struct acpi_bus_type

Replace the .find_device function pointer in struct acpi_bus_type
with a new one, .find_companion, that is supposed to point to a
function returning struct acpi_device pointer (instead of an int)
and takes one argument (instead of two).  This way the role of
this callback is more clear and the implementation of it can
be more straightforward.

Update all of the users of struct acpi_bus_type (PCI, PNP/ACPI and
USB) to reflect the structure change.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Lan Tianyu <tianyu.lan@intel.com> # for USB/ACPI

1 files changed, 3 insertions, 9 deletions

diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index adbf34003995..ce31eb0cdca7 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -303,10 +303,9 @@ void acpi_pci_remove_bus(struct pci_bus *bus)
 }
 
 /* ACPI bus type */
-static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
+static struct acpi_device *acpi_pci_find_companion(struct device *dev)
 {
         struct pci_dev *pci_dev = to_pci_dev(dev);
-        struct acpi_device *adev;
         bool check_children;
         u64 addr;
 
@@ -319,13 +318,8 @@ static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
                         || pci_dev->hdr_type == PCI_HEADER_TYPE_CARDBUS;
         /* Please ref to ACPI spec for the syntax of _ADR */
         addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
-        adev = acpi_find_child_device(ACPI_COMPANION(dev->parent), addr,
+        return acpi_find_child_device(ACPI_COMPANION(dev->parent), addr,
                                       check_children);
-        if (adev) {
-                *handle = adev->handle;
-                return 0;
-        }
-        return -ENODEV;
 }
 
 static void pci_acpi_setup(struct device *dev)
@@ -365,7 +359,7 @@ static bool pci_acpi_bus_match(struct device *dev)
 static struct acpi_bus_type acpi_pci_bus = {
         .name = "PCI",
         .match = pci_acpi_bus_match,
-        .find_device = acpi_pci_find_device,
+        .find_companion = acpi_pci_find_companion,
         .setup = pci_acpi_setup,
         .cleanup = pci_acpi_cleanup,
 };