cpuidle: ACPI: do not overwrite name and description of C0
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -978,7 +978,7 @@ static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr)
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return -EINVAL;
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drv->safe_state_index = -1;
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for (i = 0; i < CPUIDLE_STATE_MAX; i++) {
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for (i = CPUIDLE_DRIVER_STATE_START; i < CPUIDLE_STATE_MAX; i++) {
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drv->states[i].name[0] = '\0';
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drv->states[i].desc[0] = '\0';
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}
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