AUDIO_CTRL_FLAG_READABLE
#define AC97_RW (AUDIO_CTRL_FLAG_READABLE | AUDIO_CTRL_FLAG_WRITEABLE)
if (new_desc->acd_flags & AUDIO_CTRL_FLAG_READABLE) {
if (!(ctrl->ctrl_flags & AUDIO_CTRL_FLAG_READABLE)) {
(!(ctrl->ctrl_flags & AUDIO_CTRL_FLAG_READABLE))) {
if (desc.acd_flags & AUDIO_CTRL_FLAG_READABLE)