Avoid moving the head of the scatterlist entry by using temporary
pointers to walk the scatterlist.
Signed-off-by: Victoria Milhoan <vicki.milh...@freescale.com>
---
drivers/crypto/caam/sg_sw_sec4.h | 24 +++++++++++++++++-------
1 file changed, 17 insertions(+), 7 deletions(-)
diff --git a/drivers/crypto/caam/sg_sw_sec4.h b/drivers/crypto/caam/sg_sw_sec4.h
index 711bb39..18cd6d1 100644
--- a/drivers/crypto/caam/sg_sw_sec4.h
+++ b/drivers/crypto/caam/sg_sw_sec4.h
@@ -105,9 +105,15 @@ static inline void dma_unmap_sg_chained(
{
if (unlikely(chained)) {
int i;
+ struct scatterlist *tsg = sg;
+
+ /*
+ * Use a local copy of the sg pointer to avoid moving the
+ * head of the list pointed to by sg as we walk the list.
+ */
for (i = 0; i < nents; i++) {
- dma_unmap_sg(dev, sg, 1, dir);
- sg = sg_next(sg);
+ dma_unmap_sg(dev, tsg, 1, dir);
+ tsg = sg_next(tsg);
}
} else if (nents) {
dma_unmap_sg(dev, sg, nents, dir);
@@ -118,19 +124,23 @@ static inline int dma_map_sg_chained(
struct device *dev, struct scatterlist *sg, unsigned int nents,
enum dma_data_direction dir, bool chained)
{
- struct scatterlist *first = sg;
-
if (unlikely(chained)) {
int i;
+ struct scatterlist *tsg = sg;
+
+ /*
+ * Use a local copy of the sg pointer to avoid moving the
+ * head of the list pointed to by sg as we walk the list.
+ */
for (i = 0; i < nents; i++) {
- if (!dma_map_sg(dev, sg, 1, dir)) {
- dma_unmap_sg_chained(dev, first, i, dir,
+ if (!dma_map_sg(dev, tsg, 1, dir)) {
+ dma_unmap_sg_chained(dev, sg, i, dir,
chained);
nents = 0;
break;
}
- sg = sg_next(sg);
+ tsg = sg_next(tsg);
}
} else
nents = dma_map_sg(dev, sg, nents, dir);
--
2.1.4
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