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path: root/drivers/acpi/acpi_pad.c
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Diffstat (limited to 'drivers/acpi/acpi_pad.c')
-rw-r--r--drivers/acpi/acpi_pad.c34
1 files changed, 18 insertions, 16 deletions
diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
index b76848c..6b115f6 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;
}