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, 8 insertions, 13 deletions

diff --git a/drivers/pnp/pnpacpi/core.c b/drivers/pnp/pnpacpi/core.c
index e869ba698ac0..156d14e2587e 100644
--- a/drivers/pnp/pnpacpi/core.c
+++ b/drivers/pnp/pnpacpi/core.c
@@ -328,20 +328,15 @@ static int __init acpi_pnp_match(struct device *dev, void *_pnp)
             && compare_pnp_id(pnp->id, acpi_device_hid(acpi));
 }
 
-static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
+static struct acpi_device * __init acpi_pnp_find_companion(struct device *dev)
 {
-        struct device *adev;
-        struct acpi_device *acpi;
-
-        adev = bus_find_device(&acpi_bus_type, NULL,
-                               to_pnp_dev(dev), acpi_pnp_match);
-        if (!adev)
-                return -ENODEV;
+        dev = bus_find_device(&acpi_bus_type, NULL, to_pnp_dev(dev),
+                              acpi_pnp_match);
+        if (!dev)
+                return NULL;
 
-        acpi = to_acpi_device(adev);
-        *handle = acpi->handle;
-        put_device(adev);
-        return 0;
+        put_device(dev);
+        return to_acpi_device(dev);
 }
 
 /* complete initialization of a PNPACPI device includes having
@@ -355,7 +350,7 @@ static bool acpi_pnp_bus_match(struct device *dev)
 static struct acpi_bus_type __initdata acpi_pnp_bus = {
         .name        = "PNP",
         .match       = acpi_pnp_bus_match,
-        .find_device = acpi_pnp_find_device,
+        .find_companion = acpi_pnp_find_companion,
 };
 
 int pnpacpi_disabled __initdata;