On Thu, Nov 07, 2019 at 02:50:11AM +0000, Peng Fan wrote:
> From: Peng Fan <peng.fan@xxxxxxx>
>
> The dmaengine_prep_slave_sg needs to use sg count returned
> by dma_map_sg, not use sport->dma_tx_nents, because the return
> value of dma_map_sg is not always same with "nents".
>
> When enabling iommu for lpuart + edma, iommu framework may concatenate
> two sgs into one.
>
> Fixes: 6250cc30c4c4e ("tty: serial: fsl_lpuart: Use scatter/gather DMA for Tx")
> Cc: <stable@xxxxxxxxxxxxxxx>
> Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
> ---
>
> V2:
> Assign ret to sport->dma_tx_nents, then we no need to fix dma_unmap_sg
> Hi Greg,
> I saw v1 patch merged to tty-next, please help to replace with V2 if this
> is ok for you, or you need I have a follow up fix for v1.
I can not "replace" anything, my tree does not rebase, sorry. Please
send fix-up patches on top of it if there is any changes that need to
happen.
thanks,
greg k-h
