ACPI: processor: perflib: Adjust acpi_processor_notify_smm() return value

Avoid returning a confusing error code from acpi_processor_notify_smm()
if it is called for the second time in the case when SMM notification
regarding P-state control is not supported.

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

diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
index 7b6fa1b27afb7c7b27b61b40ef1093ab32e07432..970f04a958cd220a2b6a826374ba90fb458aaad0 100644 (file)
--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c
@@ -475,10 +475,12 @@ int acpi_processor_notify_smm(struct module *calling_module)
 
        result = acpi_processor_pstate_control();
        if (result <= 0) {
-               if (!result)
+               if (result) {
+                       is_done = result;
+               } else {
                        pr_debug("No SMI port or pstate_control\n");
-
-               is_done = -EIO;
+                       is_done = 1;
+               }
                goto out_put;
        }