ioat: fix 'ack' handling, driver must ensure that 'ack' is zero

commit: 6497dcffe07b7c3d863f9899280c4f6eae999161

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>

diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c
index 45e7b4666c7b3c5197eeaa0c256dcf76860a2161..8cf542b2aed4f4bc8d0788ba0470de2efdb0fbf1 100644 (file)
--- a/drivers/dma/ioat_dma.c
+++ b/drivers/dma/ioat_dma.c
@@ -726,6 +726,7 @@ static struct dma_async_tx_descriptor *ioat1_dma_prep_memcpy(
 
        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 *ioat2_dma_prep_memcpy(
 
        if (new) {
                new->len = len;
+               new->async_tx.ack = 0;
                return &new->async_tx;
        } else
                return NULL;