[PATCH] crypto: talitos - fix hash result for VMAP_STACK

[Christophe Leroy]

When VMAP_STACK is selected, stack cannot be DMA-mapped.
Therefore, the hash result has to be DMA-mapped in the request
context and copied into areq->result at completion.

Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr>
---
 drivers/crypto/talitos.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index c9d686a0e805..9bd9ff312e2d 100644
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -1728,6 +1728,7 @@ static void common_nonsnoop_hash_unmap(struct device *dev,
                                       struct ahash_request *areq)
 {
        struct talitos_ahash_req_ctx *req_ctx = ahash_request_ctx(areq);
+       struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
        struct talitos_private *priv = dev_get_drvdata(dev);
        bool is_sec1 = has_ftr_sec1(priv);
        struct talitos_desc *desc = &edesc->desc;
@@ -1738,6 +1739,9 @@ static void common_nonsnoop_hash_unmap(struct device *dev,
        if (desc->next_desc &&
            desc->ptr[5].ptr != desc2->ptr[5].ptr)
                unmap_single_talitos_ptr(dev, &desc2->ptr[5], DMA_FROM_DEVICE);
+       if (req_ctx->last)
+               memcpy(areq->result, req_ctx->hw_context,
+                      crypto_ahash_digestsize(tfm));
 
        if (req_ctx->psrc)
                talitos_sg_unmap(dev, edesc, req_ctx->psrc, NULL, 0, 0);
@@ -1869,7 +1873,7 @@ static int common_nonsnoop_hash(struct talitos_edesc 
*edesc,
        if (req_ctx->last)
                map_single_talitos_ptr(dev, &desc->ptr[5],
                                       crypto_ahash_digestsize(tfm),
-                                      areq->result, DMA_FROM_DEVICE);
+                                      req_ctx->hw_context, DMA_FROM_DEVICE);
        else
                map_single_talitos_ptr_nosync(dev, &desc->ptr[5],
                                              req_ctx->hw_context_size,
-- 
2.13.3