static int comp_open()

in most_cdev.c [116:148]

• 28 lines of code
• 8 McCabe index (conditional complexity)

static int comp_open(struct inode *inode, struct file *filp)
{
	struct comp_channel *c;
	int ret;

	c = to_channel(inode->i_cdev);
	filp->private_data = c;

	if (((c->cfg->direction == MOST_CH_RX) &&
	     ((filp->f_flags & O_ACCMODE) != O_RDONLY)) ||
	     ((c->cfg->direction == MOST_CH_TX) &&
		((filp->f_flags & O_ACCMODE) != O_WRONLY))) {
		return -EACCES;
	}

	mutex_lock(&c->io_mutex);
	if (!c->dev) {
		mutex_unlock(&c->io_mutex);
		return -ENODEV;
	}

	if (c->access_ref) {
		mutex_unlock(&c->io_mutex);
		return -EBUSY;
	}

	c->mbo_offs = 0;
	ret = most_start_channel(c->iface, c->channel_id, &comp.cc);
	if (!ret)
		c->access_ref = 1;
	mutex_unlock(&c->io_mutex);
	return ret;
}