static int hdm_poison_channel()

in most_usb.c [236:265]

• 25 lines of code
• 4 McCabe index (conditional complexity)

static int hdm_poison_channel(struct most_interface *iface, int channel)
{
	struct most_dev *mdev = to_mdev(iface);
	unsigned long flags;
	spinlock_t *lock; /* temp. lock */

	if (channel < 0 || channel >= iface->num_channels) {
		dev_warn(&mdev->usb_device->dev, "Channel ID out of range.\n");
		return -ECHRNG;
	}

	lock = mdev->channel_lock + channel;
	spin_lock_irqsave(lock, flags);
	mdev->is_channel_healthy[channel] = false;
	spin_unlock_irqrestore(lock, flags);

	cancel_work_sync(&mdev->clear_work[channel].ws);

	mutex_lock(&mdev->io_mutex);
	usb_kill_anchored_urbs(&mdev->busy_urbs[channel]);
	if (mdev->padding_active[channel])
		mdev->padding_active[channel] = false;

	if (mdev->conf[channel].data_type == MOST_CH_ASYNC) {
		del_timer_sync(&mdev->link_stat_timer);
		cancel_work_sync(&mdev->poll_work_obj);
	}
	mutex_unlock(&mdev->io_mutex);
	return 0;
}