+int dma_map_sgtable(struct device *dev, struct sg_table *sgt,
+		    enum dma_data_direction dir, unsigned long attrs)
+{
+	int nents;
+
+	nents = __dma_map_sg_attrs(dev, sgt->sgl, sgt->orig_nents, dir, attrs);
+	if (nents == 0)
+		return -EIO;
+	else if (nents < 0) {
+		if (WARN_ON_ONCE(nents != -EINVAL && nents != -ENOMEM &&
+				 nents != -EIO))
+			return -EIO;

I think this validation of the errnos needs to go into __dma_map_sg_attrs,
so that we catch it for the classic dma_map_sg callers as well.

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