acpi_drv_update_bif
if (acpi_drv_update_bif(bp) != ACPI_DRV_OK) {
(void) acpi_drv_update_bif(bp);
if (acpi_drv_update_bif(bp) != ACPI_DRV_OK) {
static int acpi_drv_update_bif(struct acpi_drv_cbat_state *bp);
res = acpi_drv_update_bif(bp);