> +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;
>
Allow dma_map_sgtable() to pass errors from the map_sg() ops. This
will be required for returning appropriate error codes when mapping
P2PDMA memory.
Introduce __dma_map_sg_attrs() which will return the raw error code
from the map_sg operation (whether it be negative or zero). Then add a
