public-mirrors/linux
1
0
Fork 0
mirror of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-09-18 22:14:16 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

dmaengine: at_xdmac: align descriptors on 64 bits

Browse source 
Having descriptors aligned on 64 bits allows update CNDA and CUBC in an
atomic way.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Fixes: e1f7c9eee7 ("dmaengine: at_xdmac: creation of the atmel
eXtended DMA Controller driver")
Cc: stable@vger.kernel.org #v4.1 and later
Reviewed-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Ludovic Desroches 2016-05-12 16:54:08 +02:00 • committed by Vinod Koul
parent c56d329e28
commit 4a9723e8df
1 changed files with 2 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
drivers/dma/at_xdmac.c
View file

@ -242,7 +242,7 @@ struct at_xdmac_lld {
u32 mbr_dus; /* Destination Microblock Stride Register */ 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_desc {
struct at_xdmac_lld lld; struct at_xdmac_lld lld;
enum dma_transfer_direction direction; enum dma_transfer_direction direction;
@ -253,7 +253,7 @@ struct at_xdmac_desc {
unsigned int xfer_size; unsigned int xfer_size;
struct list_head descs_list; struct list_head descs_list;
struct list_head xfer_node; 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) static inline void __iomem *at_xdmac_chan_reg_base(struct at_xdmac *atxdmac, unsigned int chan_nb)
{ {