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authorDan Williams <dan.j.williams@intel.com>2008-12-08 21:46:00 +0100
committerDan Williams <dan.j.williams@intel.com>2008-12-08 21:46:00 +0100
commita06d568f7c5e40e34ea64881842deb8f4382babf (patch)
tree15b38b4652705b7c58bd89052c81ab91ca94cc4a /drivers/dma/iop-adma.c
parentdmaengine: protect 'id' from concurrent registrations (diff)
downloadlinux-a06d568f7c5e40e34ea64881842deb8f4382babf.tar.xz
linux-a06d568f7c5e40e34ea64881842deb8f4382babf.zip
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/iop-adma.c')
-rw-r--r--drivers/dma/iop-adma.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c
index c7a9306d951d..6be317262200 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);
}