3.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Thomas Schlichter <thomas.schlich...@web.de>
commit c7e8bdf5872c5a8f5a6494e16fe839c38a0d3d3d upstream.
Fix a bug that leads to showing the 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.schlich...@web.de>
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnier...@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/acpi/processor_idle.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -978,7 +978,7 @@ static int acpi_processor_setup_cpuidle_
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';
}
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