poison_channel
if (c->iface->poison_channel(c->iface, c->channel_id)) {
if (!iface->enqueue || !iface->configure || !iface->poison_channel ||
mdev->iface.poison_channel = hdm_poison_channel;
dev->most_iface.poison_channel = poison_channel;
int (*poison_channel)(struct most_interface *iface, int channel_idx);