static int charlcd_open()

in charlcd.c [491:515]

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

static int charlcd_open(struct inode *inode, struct file *file)
{
	struct charlcd_priv *priv = charlcd_to_priv(the_charlcd);
	int ret;

	ret = -EBUSY;
	if (!atomic_dec_and_test(&charlcd_available))
		goto fail;	/* open only once at a time */

	ret = -EPERM;
	if (file->f_mode & FMODE_READ)	/* device is write-only */
		goto fail;

	if (priv->must_clear) {
		priv->lcd.ops->clear_display(&priv->lcd);
		priv->must_clear = false;
		priv->lcd.addr.x = 0;
		priv->lcd.addr.y = 0;
	}
	return nonseekable_open(inode, file);

 fail:
	atomic_inc(&charlcd_available);
	return ret;
}