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Subject[patch 51/76] ioat: fix ack handling, driver must ensure that ack is zero
-stable review patch.  If anyone has any objections, please let us know.
---------------------

From: Dan Williams <dan.j.williams@intel.com>

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@intel.com>
Acked-by: Shannon Nelson <shannon.nelson@intel.com>
[chrisw@sous-sol.org: backport to 2.6.24.3]
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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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