668 	struct dma_buf_attachment *attach;  in dma_buf_attach()  local
674 	attach = kzalloc(sizeof(*attach), GFP_KERNEL);  in dma_buf_attach()
675 	if (!attach)  in dma_buf_attach()
678 	attach->dev = dev;  in dma_buf_attach()
679 	attach->dmabuf = dmabuf;  in dma_buf_attach()
683 	if (dmabuf->ops->attach) {  in dma_buf_attach()
684 		ret = dmabuf->ops->attach(dmabuf, attach);  in dma_buf_attach()
688 	list_add(&attach->node, &dmabuf->attachments);  in dma_buf_attach()
692 	return attach;  in dma_buf_attach()
695 	kfree(attach);  in dma_buf_attach()
709 void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach)  in dma_buf_detach()  argument
711 	if (WARN_ON(!dmabuf || !attach))  in dma_buf_detach()
714 	if (attach->sgt)  in dma_buf_detach()
715 		dmabuf->ops->unmap_dma_buf(attach, attach->sgt, attach->dir);  in dma_buf_detach()
718 	list_del(&attach->node);  in dma_buf_detach()
720 		dmabuf->ops->detach(dmabuf, attach);  in dma_buf_detach()
723 	kfree(attach);  in dma_buf_detach()
742 struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *attach,  in dma_buf_map_attachment()  argument
749 	if (WARN_ON(!attach || !attach->dmabuf))  in dma_buf_map_attachment()
752 	if (attach->sgt) {  in dma_buf_map_attachment()
757 		if (attach->dir != direction &&  in dma_buf_map_attachment()
758 		    attach->dir != DMA_BIDIRECTIONAL)  in dma_buf_map_attachment()
761 		return attach->sgt;  in dma_buf_map_attachment()
764 	sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction);  in dma_buf_map_attachment()
768 	if (!IS_ERR(sg_table) && attach->dmabuf->ops->cache_sgt_mapping) {  in dma_buf_map_attachment()
769 		attach->sgt = sg_table;  in dma_buf_map_attachment()
770 		attach->dir = direction;  in dma_buf_map_attachment()
787 void dma_buf_unmap_attachment(struct dma_buf_attachment *attach,  in dma_buf_unmap_attachment()  argument
793 	if (WARN_ON(!attach || !attach->dmabuf || !sg_table))  in dma_buf_unmap_attachment()
796 	if (attach->sgt == sg_table)  in dma_buf_unmap_attachment()
799 	attach->dmabuf->ops->unmap_dma_buf(attach, sg_table, direction);  in dma_buf_unmap_attachment()