AF_BUSRST_DETECTED
test_bit(AF_BUSRST_DETECTED, &a->flags) ||
clear_bit(AF_BUSRST_DETECTED, &a->flags);
set_bit(AF_BUSRST_DETECTED, &a->flags);
if (test_bit(AF_BUSRST_DETECTED, &a->flags)) {
clear_bit(AF_BUSRST_DETECTED, &a->flags);
set_bit(AF_BUSRST_DETECTED, &a->flags);