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Commit 6497dcff authored by Dan Williams's avatar Dan Williams
Browse files

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



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: default avatarDan Williams <dan.j.williams@intel.com>
Acked-by: default avatarShannon Nelson <shannon.nelson@intel.com>
Cc: stable@kernel.org
parent ec8670f1

drivers/dma/ioat_dma.c

+2 −0
Original line number Original line Diff line number Diff line
@@ -714,6 +714,7 @@ static struct dma_async_tx_descriptor *ioat1_dma_prep_memcpy( 
		new->len = len;

		new->len = len;

		new->dst = dma_dest;

		new->dst = dma_dest;

		new->src = dma_src;

		new->src = dma_src;

		new->async_tx.ack = 0;

		return &new->async_tx;

		return &new->async_tx;

	} else

	} else

		return NULL;

		return NULL;
@@ -741,6 +742,7 @@ static struct dma_async_tx_descriptor *ioat2_dma_prep_memcpy( 
		new->len = len;

		new->len = len;

		new->dst = dma_dest;

		new->dst = dma_dest;

		new->src = dma_src;

		new->src = dma_src;

		new->async_tx.ack = 0;

		return &new->async_tx;

		return &new->async_tx;

	} else

	} else

		return NULL;

		return NULL;