ACPI: glue: Rearrange find_child_checks()

Notice that it is not necessary to evaluate _STA in find_child_checks()
if the device is expected to have children, but there are none, so
move the children check to the front of the function.

Also notice that FIND_CHILD_MIN_SCORE can be returned right away if
_STA is missing, so make the function do so.

Finally, replace the ternary operator in the return statement argument
with an if () and a standalone return which is somewhat easier to
follow.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index ef10480..8d76911 100644 (file)
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -79,17 +79,17 @@ static struct acpi_bus_type *acpi_get_bus_type(struct device *dev)
 
 static int find_child_checks(struct acpi_device *adev, bool check_children)
 {
-       bool sta_present = true;
        unsigned long long sta;
        acpi_status status;
 
+       if (check_children && list_empty(&adev->children))
+               return -ENODEV;
+
        status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
        if (status == AE_NOT_FOUND)
-               sta_present = false;
-       else if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED))
-               return -ENODEV;
+               return FIND_CHILD_MIN_SCORE;
 
-       if (check_children && list_empty(&adev->children))
+       if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED))
                return -ENODEV;
 
        /*
@@ -99,8 +99,10 @@ static int find_child_checks(struct acpi_device *adev, bool check_children)
         * matched going forward.  [This means a second spec violation in a row,
         * so whatever we do here is best effort anyway.]
         */
-       return sta_present && !adev->pnp.type.platform_id ?
-                       FIND_CHILD_MAX_SCORE : FIND_CHILD_MIN_SCORE;
+       if (adev->pnp.type.platform_id)
+               return FIND_CHILD_MIN_SCORE;
+
+       return FIND_CHILD_MAX_SCORE;
 }
 
 struct acpi_device *acpi_find_child_device(struct acpi_device *parent,