>From d8357a73b8bf4e23a4b5ac4499224b39d0079ddb Mon Sep 17 00:00:00 2001
From: Thomas Schlichter <thomas.schlichter@web.de>
Date: Tue, 31 Mar 2015 20:24:39 +0200
Subject: [PATCH 2/2] ACPI / cpuidle: do not overwrite name and description of
 C0

This fixes a bug that leads to showing name and description of C-state C0 as
"<null>" in sysfs after the ACPI C-states changed (e.g. after AC->DC or DC->AC
transition).

The function poll_idle_init() in drivers/cpuidle/driver.c initializes the
state 0 during cpuidle_register_driver(). So we better do not overwrite it
again with '\0' during acpi_processor_cst_has_changed().

Signed-off-by: Thomas Schlichter <thomas.schlichter@web.de>
---
 drivers/acpi/processor_idle.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index c6bb9f1..f98db0b 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -922,7 +922,7 @@ static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr)
 		return -EINVAL;
 
 	drv->safe_state_index = -1;
-	for (i = 0; i < CPUIDLE_STATE_MAX; i++) {
+	for (i = CPUIDLE_DRIVER_STATE_START; i < CPUIDLE_STATE_MAX; i++) {
 		drv->states[i].name[0] = '\0';
 		drv->states[i].desc[0] = '\0';
 	}
-- 
2.1.0