diff --git a/sys/compat/linuxkpi/common/include/linux/dma-mapping.h b/sys/compat/linuxkpi/common/include/linux/dma-mapping.h
--- a/sys/compat/linuxkpi/common/include/linux/dma-mapping.h
+++ b/sys/compat/linuxkpi/common/include/linux/dma-mapping.h
@@ -448,7 +448,7 @@
 {
 	int nents;
 
-	nents = dma_map_sg_attrs(dev, sgt->sgl, sgt->nents, dir, attrs);
+	nents = dma_map_sg_attrs(dev, sgt->sgl, sgt->orig_nents, dir, attrs);
 	if (nents < 0)
 		return (nents);
 	sgt->nents = nents;
@@ -461,7 +461,7 @@
     unsigned long attrs)
 {
 
-	dma_unmap_sg_attrs(dev, sgt->sgl, sgt->nents, dir, attrs);
+	dma_unmap_sg_attrs(dev, sgt->sgl, sgt->orig_nents, dir, attrs);
 }