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Commit c9ad8e06 authored by Len Brown's avatar Len Brown
Browse files

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: default avatarLen Brown <len.browns@intel.com>
parent 25cb1bfd

drivers/acpi/acpi_pad.c

+18 −16
Original line number Diff line number Diff line
@@ -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;



	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;

	if (rev != 1 || num < 0)

		goto out;

	*num_cpus = num;

	ret = 0;

out:



	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;

	}