[PATCH 3.17 039/146] dmaengine: fix xor sources continuation

From: Greg Kroah-Hartman
Date: Tue Oct 28 2014 - 03:54:19 EST


3.17-stable review patch. If anyone has any objections, please let me know.

------------------

From: Xuelin Shi <xuelin.shi@xxxxxxxxxxxxx>

commit 87cea76384257e6ac3fa4791b6a6b9d0335f7457 upstream.

the partial xor result must be kept until the next
tx is generated.

Signed-off-by: Xuelin Shi <xuelin.shi@xxxxxxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
crypto/async_tx/async_xor.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

--- a/crypto/async_tx/async_xor.c
+++ b/crypto/async_tx/async_xor.c
@@ -78,8 +78,6 @@ do_async_xor(struct dma_chan *chan, stru
tx = dma->device_prep_dma_xor(chan, dma_dest, src_list,
xor_src_cnt, unmap->len,
dma_flags);
- src_list[0] = tmp;
-

if (unlikely(!tx))
async_tx_quiesce(&submit->depend_tx);
@@ -92,6 +90,7 @@ do_async_xor(struct dma_chan *chan, stru
xor_src_cnt, unmap->len,
dma_flags);
}
+ src_list[0] = tmp;

dma_set_unmap(tx, unmap);
async_tx_submit(chan, tx, submit);


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