On Monday 02 November 2015 17:03:58 John Garry wrote:
> >
> > Can do. Actually sg_req seems only ever has one element:
> > expander.c, smp_execute_task()
> > sg_init_one(&task->smp_task.smp_req, req, req_size);
> >
> >
> I tried replacing with dma_map_single, but I feel the code is not as
> clean as I need to manually set sg_dma_len() and sg_dma_address():
> req_len = sg_dma_len(sg_req) = sg_req->length;
> sg_dma_address(sg_req) = dma_map_single(dev, sg_virt(sg_req),
> req_len, DMA_TO_DEVICE);
> if (dma_mapping_error(dev, sg_dma_address(sg_req)))
> return -ENOMEM;
> sg_dma_address(sg_req) is used in another function for unmap.
>
> opinion?
>
What I meant was not using a struct scatterlist at all:
replace the 'sg_req' variable with a normal pointer, and then
do
hdr->cmd_table_addr = cpu_to_le64(dma_map_single(dev, req, len,
DMA_TO_DEVICE));
Any reason this won't work?
Arnd
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