Le 12/05/2016 16:54, Ludovic Desroches a écrit :
> Having descriptors aligned on 64 bits allows update CNDA and CUBC in an
> atomic way.
>
> Signed-off-by: Ludovic Desroches <ludovic.desroches@xxxxxxxxx>
> Fixes: e1f7c9eee707 ("dmaengine: at_xdmac: creation of the atmel
> eXtended DMA Controller driver")
> Cc: stable@xxxxxxxxxxxxxxx #v4.1 and later
Reviewed-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
> ---
> drivers/dma/at_xdmac.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
> index 8e304b1..ba9b0b7 100644
> --- a/drivers/dma/at_xdmac.c
> +++ b/drivers/dma/at_xdmac.c
> @@ -242,7 +242,7 @@ struct at_xdmac_lld {
> u32 mbr_dus; /* Destination Microblock Stride Register */
> };
>
> -
> +/* 64-bit alignment needed to update CNDA and CUBC registers in an atomic way. */
> struct at_xdmac_desc {
> struct at_xdmac_lld lld;
> enum dma_transfer_direction direction;
> @@ -253,7 +253,7 @@ struct at_xdmac_desc {
> unsigned int xfer_size;
> struct list_head descs_list;
> struct list_head xfer_node;
> -};
> +} __aligned(sizeof(u64));
>
> static inline void __iomem *at_xdmac_chan_reg_base(struct at_xdmac *atxdmac, unsigned int chan_nb)
> {
>
--
Nicolas Ferre
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