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Subject[PATCH 07/29] ioat: fix type mismatch for ->dmacount
->dmacount tracks the sequence number of active descriptors.  It is
written to the DMACOUNT register to update the channel's view of pending
descriptors in the chain. The register is 16-bits so ->dmacount should
be unsigned and 16-bit as well. Also modify ->desccount to maintain

This was never a problem in practice because we never compared dmacount
values, but this is a bug waiting to happen.

Signed-off-by: Maciej Sosnowski <>
Signed-off-by: Dan Williams <>
drivers/dma/ioat/dma.h | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h
index 1226e35..9f0c853 100644
--- a/drivers/dma/ioat/dma.h
+++ b/drivers/dma/ioat/dma.h
@@ -102,8 +102,8 @@ struct ioat_dma_chan {
struct delayed_work work;

int pending;
- int dmacount;
- int desccount;
+ u16 dmacount;
+ u16 desccount;

struct ioatdma_device *device;
struct dma_chan common;

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