[patch 51/76] ioat: fix ack handling, driver must ensure that ack is zero

[Chris Wright]

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

From: Dan Williams <dan.j.williams@xxxxxxxxx>

Initialize 'ack' to zero in case the descriptor has been recycled.

Prevents "kernel BUG at crypto/async_tx/async_xor.c:185!"

Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Acked-by: Shannon Nelson <shannon.nelson@xxxxxxxxx>
[chrisw@xxxxxxxxxxxx: backport to 2.6.24.3]
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---

 drivers/dma/ioat_dma.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/dma/ioat_dma.c
+++ b/drivers/dma/ioat_dma.c
@@ -726,6 +726,7 @@ static struct dma_async_tx_descriptor *i
 
 	if (new) {
 		new->len = len;
+		new->async_tx.ack = 0;
 		return &new->async_tx;
 	} else
 		return NULL;
@@ -749,6 +750,7 @@ static struct dma_async_tx_descriptor *i
 
 	if (new) {
 		new->len = len;
+		new->async_tx.ack = 0;
 		return &new->async_tx;
 	} else
 		return NULL;

-- 
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