int dma_buf_vmap()

in dma-buf.c [1263:1298]

• 27 lines of code
• 5 McCabe index (conditional complexity)

int dma_buf_vmap(struct dma_buf *dmabuf, struct dma_buf_map *map)
{
	struct dma_buf_map ptr;
	int ret = 0;

	dma_buf_map_clear(map);

	if (WARN_ON(!dmabuf))
		return -EINVAL;

	if (!dmabuf->ops->vmap)
		return -EINVAL;

	mutex_lock(&dmabuf->lock);
	if (dmabuf->vmapping_counter) {
		dmabuf->vmapping_counter++;
		BUG_ON(dma_buf_map_is_null(&dmabuf->vmap_ptr));
		*map = dmabuf->vmap_ptr;
		goto out_unlock;
	}

	BUG_ON(dma_buf_map_is_set(&dmabuf->vmap_ptr));

	ret = dmabuf->ops->vmap(dmabuf, &ptr);
	if (WARN_ON_ONCE(ret))
		goto out_unlock;

	dmabuf->vmap_ptr = ptr;
	dmabuf->vmapping_counter = 1;

	*map = dmabuf->vmap_ptr;

out_unlock:
	mutex_unlock(&dmabuf->lock);
	return ret;
}