Commit c7e8bdf5 authored Mar 31, 2015 by Thomas Schlichter Committed by Rafael J. Wysocki Apr 03, 2015

cpuidle: ACPI: do not overwrite name and description of C0



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.schlichter@web.de>
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: 3.13+ <stable@vger.kernel.org> # 3.13+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent d75e4af1

drivers/acpi/processor_idle.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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';
		}