[PATCH 2/9] block: add scatterlist-less DMA mapping helpers

[Christoph Hellwig]

On Mon, Jun 16, 2025 at 08:43:22AM +0200, Daniel Gomez wrote:
> >> This comment does not match with blk_rq_dma_map_iter_start(). It returns false
> >> and status is BLK_STS_INVAL.
> > 
> > I went over you comment a few times and still don't understand it.
> 
> The way I read the comment is that status is only valid when
> blk_rq_dma_map_iter_* returns false.

Yes.

> But blk_rq_dma_map_iter_start() can return false and an invalid status (in the
> default switch case).

The status field is valid.  Your patch below leaves it uninitialized
instead, which leaves me even more confused than the previous comment.