HSC_CH_READ
if (test_bit(HSC_CH_READ, &channel->flags)) {
if (!test_bit(HSC_CH_READ, &channel->flags))
clear_bit(HSC_CH_READ, &channel->flags);
if (test_and_set_bit(HSC_CH_READ, &channel->flags))
clear_bit(HSC_CH_READ, &channel->flags);
clear_bit(HSC_CH_READ, &channel->flags);
clear_bit(HSC_CH_READ, &channel->flags);