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    Subject[PATCH 3.13.y-ckt 64/90] cpuidle: ACPI: do not overwrite name and description of C0
    Date
    3.13.11-ckt20 -stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Thomas Schlichter <thomas.schlichter@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.schlichter@web.de>
    Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
    Signed-off-by: Kamal Mostafa <kamal@canonical.com>
    ---
    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 ba60290..f1df2e4 100644
    --- a/drivers/acpi/processor_idle.c
    +++ b/drivers/acpi/processor_idle.c
    @@ -973,7 +973,7 @@ 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';
    }
    --
    1.9.1


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