snd_compr_set_metadata(struct snd_compr_stream *stream, unsigned long arg)
{
	struct snd_compr_metadata metadata;
	int retval;

	if (!stream->ops->set_metadata)
		return -ENXIO;
	/*
	* we should allow parameter change only when stream has been
	* opened not in other cases
	*/
	if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
		return -EFAULT;

	retval = stream->ops->set_metadata(stream, &metadata);
	stream->metadata_set = true;

	return retval;
}

Unknown