F_DISABLE_WRITE_NDELAY
clear_bit(F_DISABLE_WRITE_NDELAY, &chip->flags);
set_bit(F_DISABLE_WRITE_NDELAY, &chip->flags);
clear_bit(F_DISABLE_WRITE_NDELAY, &chip->flags);
set_bit(F_DISABLE_WRITE_NDELAY, &chip->flags);