ACPI: acpi_pad: simplify code to avoid false gcc build warning

acpi_pad.c:432: warning: ‘num_cpus’ may be used uninitialized in this function

gcc 4.4.4 was unable to notice that num_cpus is always set.
Re-arrange the code to un-confuse gcc, and also make
it easier for humans to read....

Signed-off-by: Len Brown <len.browns@intel.com>

1 files changed, 18 insertions, 16 deletions

diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
index b76848c80be3..6b115f6c4313 100644
--- a/drivers/acpi/acpi_pad.c
+++ b/drivers/acpi/acpi_pad.c
@@ -382,31 +382,32 @@ static void acpi_pad_remove_sysfs(struct acpi_device *device)
         device_remove_file(&device->dev, &dev_attr_rrtime);
 }
 
-/* Query firmware how many CPUs should be idle */
-static int acpi_pad_pur(acpi_handle handle, int *num_cpus)
+/*
+ * Query firmware how many CPUs should be idle
+ * return -1 on failure
+ */
+static int acpi_pad_pur(acpi_handle handle)
 {
         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
         union acpi_object *package;
-        int rev, num, ret = -EINVAL;
+        int num = -1;
 
         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_PUR", NULL, &buffer)))
-                return -EINVAL;
+                return num;
 
         if (!buffer.length || !buffer.pointer)
-                return -EINVAL;
+                return num;
 
         package = buffer.pointer;
-        if (package->type != ACPI_TYPE_PACKAGE || package->package.count != 2)
-                goto out;
-        rev = package->package.elements[0].integer.value;
-        num = package->package.elements[1].integer.value;
-        if (rev != 1 || num < 0)
-                goto out;
-        *num_cpus = num;
-        ret = 0;
-out:
+
+        if (package->type == ACPI_TYPE_PACKAGE &&
+                package->package.count == 2 &&
+                package->package.elements[0].integer.value == 1) /* rev 1 */
+
+                num = package->package.elements[1].integer.value;
+
         kfree(buffer.pointer);
-        return ret;
+        return num;
 }
 
 /* Notify firmware how many CPUs are idle */
@@ -433,7 +434,8 @@ static void acpi_pad_handle_notify(acpi_handle handle)
         uint32_t idle_cpus;
 
         mutex_lock(&isolated_cpus_lock);
-        if (acpi_pad_pur(handle, &num_cpus)) {
+        num_cpus = acpi_pad_pur(handle);
+        if (num_cpus < 0) {
                 mutex_unlock(&isolated_cpus_lock);
                 return;
         }