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authorDan Williams <dan.j.williams@intel.com>2008-12-08 13:46:00 -0700
committerDan Williams <dan.j.williams@intel.com>2008-12-08 13:46:00 -0700
commita06d568f7c5e40e34ea64881842deb8f4382babf (patch)
tree15b38b4652705b7c58bd89052c81ab91ca94cc4a /drivers/dma
parentb0b42b16ff2b90f17bc1a4308366c9beba4b276e (diff)
async_xor: dma_map destination DMA_BIDIRECTIONAL
Mapping the destination multiple times is a misuse of the dma-api. Since the destination may be reused as a source, ensure that it is only mapped once and that it is mapped bidirectionally. This appears to add ugliness on the unmap side in that it always reads back the destination address from the descriptor, but gcc can determine that dma_unmap is a nop and not emit the code that calculates its arguments. Cc: <stable@kernel.org> Cc: Saeed Bishara <saeed@marvell.com> Acked-by: Yuri Tikhonov <yur@emcraft.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/iop-adma.c16
-rw-r--r--drivers/dma/mv_xor.c15
2 files changed, 25 insertions, 6 deletions
diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c
index c7a9306d951..6be31726220 100644
--- a/drivers/dma/iop-adma.c
+++ b/drivers/dma/iop-adma.c
@@ -85,18 +85,28 @@ iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc,
enum dma_ctrl_flags flags = desc->async_tx.flags;
u32 src_cnt;
dma_addr_t addr;
+ dma_addr_t dest;
+ src_cnt = unmap->unmap_src_cnt;
+ dest = iop_desc_get_dest_addr(unmap, iop_chan);
if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
- addr = iop_desc_get_dest_addr(unmap, iop_chan);
- dma_unmap_page(dev, addr, len, DMA_FROM_DEVICE);
+ enum dma_data_direction dir;
+
+ if (src_cnt > 1) /* is xor? */
+ dir = DMA_BIDIRECTIONAL;
+ else
+ dir = DMA_FROM_DEVICE;
+
+ dma_unmap_page(dev, dest, len, dir);
}
if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
- src_cnt = unmap->unmap_src_cnt;
while (src_cnt--) {
addr = iop_desc_get_src_addr(unmap,
iop_chan,
src_cnt);
+ if (addr == dest)
+ continue;
dma_unmap_page(dev, addr, len,
DMA_TO_DEVICE);
}
diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c
index 0328da020a1..bcda1742641 100644
--- a/drivers/dma/mv_xor.c
+++ b/drivers/dma/mv_xor.c
@@ -311,17 +311,26 @@ mv_xor_run_tx_complete_actions(struct mv_xor_desc_slot *desc,
enum dma_ctrl_flags flags = desc->async_tx.flags;
u32 src_cnt;
dma_addr_t addr;
+ dma_addr_t dest;
+ src_cnt = unmap->unmap_src_cnt;
+ dest = mv_desc_get_dest_addr(unmap);
if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
- addr = mv_desc_get_dest_addr(unmap);
- dma_unmap_page(dev, addr, len, DMA_FROM_DEVICE);
+ enum dma_data_direction dir;
+
+ if (src_cnt > 1) /* is xor ? */
+ dir = DMA_BIDIRECTIONAL;
+ else
+ dir = DMA_FROM_DEVICE;
+ dma_unmap_page(dev, dest, len, dir);
}
if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
- src_cnt = unmap->unmap_src_cnt;
while (src_cnt--) {
addr = mv_desc_get_src_addr(unmap,
src_cnt);
+ if (addr == dest)
+ continue;
dma_unmap_page(dev, addr, len,
DMA_TO_DEVICE);
}