On Wed, May 24, 2017 at 11:58 PM, Logan Gunthorpe <logang@xxxxxxxxxxxx> wrote:
> Two dma engine drivers directly accesses page_link assuming knowledge
> that should be contained only in scatterlist.h.
>
> We replace these with calls to sg_chain and sg_assign_page.
>
> Signed-off-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>
> Signed-off-by: Stephen Bates <sbates@xxxxxxxxxxxx>
> Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
> Cc: Vinod Koul <vinod.koul@xxxxxxxxx>
> Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
OMG I guess you know what you're doing, so:
Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
I will shout if Ux500 breaks.
CC Per Förlin who wrote the code.
> drivers/dma/imx-dma.c | 7 ++-----
> drivers/dma/ste_dma40.c | 5 +----
> 2 files changed, 3 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c
> index ab0fb80..f681df8 100644
> --- a/drivers/dma/imx-dma.c
> +++ b/drivers/dma/imx-dma.c
> @@ -888,7 +888,7 @@ static struct dma_async_tx_descriptor *imxdma_prep_dma_cyclic(
> sg_init_table(imxdmac->sg_list, periods);
>
> for (i = 0; i < periods; i++) {
> - imxdmac->sg_list[i].page_link = 0;
> + sg_assign_page(&imxdmac->sg_list[i], NULL);
> imxdmac->sg_list[i].offset = 0;
> imxdmac->sg_list[i].dma_address = dma_addr;
> sg_dma_len(&imxdmac->sg_list[i]) = period_len;
> @@ -896,10 +896,7 @@ static struct dma_async_tx_descriptor *imxdma_prep_dma_cyclic(
> }
>
> /* close the loop */
> - imxdmac->sg_list[periods].offset = 0;
> - sg_dma_len(&imxdmac->sg_list[periods]) = 0;
> - imxdmac->sg_list[periods].page_link =
> - ((unsigned long)imxdmac->sg_list | 0x01) & ~0x02;
> + sg_chain(imxdmac->sg_list, periods + 1, imxdmac->sg_list);
>
> desc->type = IMXDMA_DESC_CYCLIC;
> desc->sg = imxdmac->sg_list;
> diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
> index a6620b6..c3052fb 100644
> --- a/drivers/dma/ste_dma40.c
> +++ b/drivers/dma/ste_dma40.c
> @@ -2528,10 +2528,7 @@ dma40_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t dma_addr,
> dma_addr += period_len;
> }
>
> - sg[periods].offset = 0;
> - sg_dma_len(&sg[periods]) = 0;
> - sg[periods].page_link =
> - ((unsigned long)sg | 0x01) & ~0x02;
> + sg_chain(sg, periods + 1, sg);
>
> txd = d40_prep_sg(chan, sg, sg, periods, direction,
> DMA_PREP_INTERRUPT);
> --
> 2.1.4
>
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